Android Tabbed Activity：如何创建一个 fragment 来扩展 activity 布局并在该 fragment 上运行 activity？
Android Tabbed Activity: How to create a fragment that inflates a activity layout and runs a activity on the fragment?
我想使用选项卡 activity 在加速度计数据选项卡和日志选项卡之间滚动。我有一个 java 片段，它使加速度计布局膨胀，还调用加速度计 class 来显示布局信息。
这两个活动似乎同时开始，因为该应用程序以加速度计 activity 启动，当按下后退按钮时，它会转到选项卡 activity。我的清单中有问题吗？ （包括大部分项目文件）
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nrtj.sleeptracker" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".AccelerometerActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
</intent-filter>
</activity>
</application>
</manifest>
这是调用加速度计布局的 Fragment 和 activity:
public class AccelerometerFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_accelerometer, container, false);
return rootView;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent(getActivity(), AccelerometerActivity.class);
startActivity(intent);
}
}
这是加速度计布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/x_axis_Text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="none"
android:paddingLeft="50dp"
android:textColor="#0000FF"
android:background="#FFFFFF"
android:text="@string/x_axis_title"
android:textSize="@android:dimen/notification_large_icon_height" />
<TextView
android:id="@+id/y_axis_Text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="none"
android:paddingLeft="50dp"
android:textColor="#008800"
android:background="#FFFFFF"
android:text="@string/y_axis_title"
android:textSize="@android:dimen/notification_large_icon_height" />
<TextView
android:id="@+id/z_axis_Text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="none"
android:paddingLeft="50dp"
android:textColor="#FF0000"
android:background="#FFFFFF"
android:text="@string/z_axis_title"
android:textSize="@android:dimen/notification_large_icon_height" />
<com.androidplot.xy.XYPlot
android:id="@+id/dynamicPlot"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="#FFFFFF"
android:layout_weight="0.62"
title="@string/dynamic_plot" />
</LinearLayout>
这是加速度计activity（它从 Pebble Watch 获取数据）：
public class AccelerometerActivity extends Activity {
private static final String TAG = "SleepTracker";
// The tuple key corresponding to a vector received from the watch
private static final int PP_KEY_CMD = 128;
private static final int PP_KEY_X = 1;
private static final int PP_KEY_Y = 2;
private static final int PP_KEY_Z = 3;
@SuppressWarnings("unused")
private static final int PP_CMD_INVALID = 0;
private static final int PP_CMD_VECTOR = 1;
public static final int VECTOR_INDEX_X = 0;
public static final int VECTOR_INDEX_Y = 1;
public static final int VECTOR_INDEX_Z = 2;
private static int vector[] = new int[3];
private PebbleKit.PebbleDataReceiver dataReceiver;
// This UUID identifies the SleepTracker app.
private static final UUID SLEEPTRACKER_UUID = UUID.fromString("273761eb-97dc-4f08-b353-3384a2170902");
private static final int SAMPLE_SIZE = 30;
private XYPlot xyPlot = null;
SimpleXYSeries xSeries = null;
SimpleXYSeries ySeries = null;
SimpleXYSeries zSeries = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i(TAG, "onCreate: ");
setContentView(R.layout.activity_accelerometer);
vector[VECTOR_INDEX_X] = 0;
vector[VECTOR_INDEX_Y] = 0;
vector[VECTOR_INDEX_Z] = 0;
PebbleKit.startAppOnPebble(getApplicationContext(), SLEEPTRACKER_UUID);
xyPlot = (XYPlot) findViewById(R.id.dynamicPlot);
xyPlot.getGraphWidget().getBackgroundPaint().setColor(Color.WHITE);
xyPlot.getGraphWidget().getGridBackgroundPaint().setColor(Color.WHITE);
xyPlot.getGraphWidget().setDomainValueFormat(new DecimalFormat("0.0"));
xyPlot.getGraphWidget().setRangeValueFormat(new DecimalFormat("0"));
xyPlot.getGraphWidget().getDomainLabelPaint().setColor(Color.BLACK);
xyPlot.getGraphWidget().getRangeLabelPaint().setColor(Color.BLACK);
xyPlot.getGraphWidget().getDomainOriginLabelPaint().setColor(Color.BLACK);
xyPlot.getGraphWidget().getDomainOriginLinePaint().setColor(Color.BLACK);
xyPlot.getGraphWidget().getRangeOriginLinePaint().setColor(Color.BLACK);
xyPlot.setTicksPerDomainLabel(1);
xyPlot.setTicksPerRangeLabel(1);
xyPlot.getGraphWidget().getDomainLabelPaint().setTextSize(30);
xyPlot.getGraphWidget().getRangeLabelPaint().setTextSize(30);
xyPlot.getGraphWidget().setDomainLabelWidth(40);
xyPlot.getGraphWidget().setRangeLabelWidth(80);
xyPlot.setDomainLabel("time");
xyPlot.getDomainLabelWidget().pack();
xyPlot.setRangeLabel("G-force");
xyPlot.getRangeLabelWidget().pack();
xyPlot.setRangeBoundaries(-1024, 1024, BoundaryMode.FIXED);
xyPlot.setDomainBoundaries(0, SAMPLE_SIZE, BoundaryMode.FIXED);
xSeries = new SimpleXYSeries("X-axis");
xSeries.useImplicitXVals();
ySeries = new SimpleXYSeries("Y-axis");
ySeries.useImplicitXVals();
zSeries = new SimpleXYSeries("Z-axis");
zSeries.useImplicitXVals();
// Blue line for X axis.
LineAndPointFormatter fmtX = new LineAndPointFormatter(Color.BLUE, null, null, null);
xyPlot.addSeries(xSeries, fmtX);
// Green line for Y axis.
LineAndPointFormatter fmtY = new LineAndPointFormatter(Color.GREEN, null, null, null);
xyPlot.addSeries(ySeries, fmtY);
// Red line for Z axis.
LineAndPointFormatter fmtZ = new LineAndPointFormatter(Color.RED, null, null, null);
xyPlot.addSeries(zSeries, fmtZ);
}
@Override
public void onPause() {
super.onPause();
Log.i(TAG, "onPause: ");
setContentView(R.layout.activity_accelerometer);
if (dataReceiver != null) {
unregisterReceiver(dataReceiver);
dataReceiver = null;
}
PebbleKit.closeAppOnPebble(getApplicationContext(), SLEEPTRACKER_UUID);
}
@Override
public void onResume() {
super.onResume();
Log.i(TAG, "onResume: ");
final Handler handler = new Handler();
dataReceiver = new PebbleKit.PebbleDataReceiver(SLEEPTRACKER_UUID) {
@Override
public void receiveData(final Context context, final int transactionId, final PebbleDictionary dict) {
handler.post(new Runnable() {
@Override
public void run() {
PebbleKit.sendAckToPebble(context, transactionId);
final Long cmdValue = dict.getInteger(PP_KEY_CMD);
if (cmdValue == null) {
return;
}
if (cmdValue.intValue() == PP_CMD_VECTOR) {
// Capture the received vector.
final Long xValue = dict.getInteger(PP_KEY_X);
if (xValue != null) {
vector[VECTOR_INDEX_X] = xValue.intValue();
}
final Long yValue = dict.getInteger(PP_KEY_Y);
if (yValue != null) {
vector[VECTOR_INDEX_Y] = yValue.intValue();
}
final Long zValue = dict.getInteger(PP_KEY_Z);
if (zValue != null) {
vector[VECTOR_INDEX_Z] = zValue.intValue();
}
// Update the user interface.
updateUI();
}
}
});
}
};
PebbleKit.registerReceivedDataHandler(this, dataReceiver);
}
public void updateUI() {
final String x = String.format(Locale.getDefault(), "X: %d", vector[VECTOR_INDEX_X]);
final String y = String.format(Locale.getDefault(), "Y: %d", vector[VECTOR_INDEX_Y]);
final String z = String.format(Locale.getDefault(), "Z: %d", vector[VECTOR_INDEX_Z]);
// Update the numerical fields
TextView x_axis_tv = (TextView) findViewById(R.id.x_axis_Text);
x_axis_tv.setText(x);
TextView y_axis_tv = (TextView) findViewById(R.id.y_axis_Text);
y_axis_tv.setText(y);
TextView z_axis_tv = (TextView) findViewById(R.id.z_axis_Text);
z_axis_tv.setText(z);
// Update the Plot
// Remove oldest vector data.
if (xSeries.size() > SAMPLE_SIZE) {
xSeries.removeFirst();
ySeries.removeFirst();
zSeries.removeFirst();
}
// Add the latest vector data.
xSeries.addLast(null, vector[VECTOR_INDEX_X]);
ySeries.addLast(null, vector[VECTOR_INDEX_Y]);
zSeries.addLast(null, vector[VECTOR_INDEX_Z]);
// Redraw the Plots.
xyPlot.redraw();
}
}
这是 MainActivity：
public class MainActivity extends AppCompatActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
Fragment fragment = null;
if(position == 0){
fragment = new LogFragment();
}
if(position == 1){
fragment = new AccelerometerFragment();
}
return fragment;
}
@Override
public int getCount() {
// Show 2 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
}
return null;
}
}
}
如有任何帮助，我们将不胜感激！
How to create a fragment that inflates a activity layout and runs a activity on the fragment?
你没有。
Both activities seem to start at the same time because the app starts with the accelerometer activity and when the back button is pressed it goes to the tabbed activity
这正是您告诉 Android 要做的。您正在 AccelerometerFragment 的 onCreate() 中呼叫 startActivity()。正如方法名称所暗示的那样，startActivity() 启动了一个 activity。在这种情况下，您开始 AccelerometerActivity.
将业务逻辑从 AccelerometerActivity 移动到 AccelerometerFragment。然后，去掉AccelerometerFragment中的onCreate()。然后，要么：
完全摆脱 AccelerometerActivity，或者
如果你想让加速度计的东西显示在 MainActivity 和 中单独的 activity，有 AccelerometerActivity 显示它自己的实例 AccelerometerFragment
我想使用选项卡 activity 在加速度计数据选项卡和日志选项卡之间滚动。我有一个 java 片段，它使加速度计布局膨胀，还调用加速度计 class 来显示布局信息。
这两个活动似乎同时开始，因为该应用程序以加速度计 activity 启动，当按下后退按钮时，它会转到选项卡 activity。我的清单中有问题吗？ （包括大部分项目文件）
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nrtj.sleeptracker" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".AccelerometerActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
</intent-filter>
</activity>
</application>
</manifest>
这是调用加速度计布局的 Fragment 和 activity:
public class AccelerometerFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_accelerometer, container, false);
return rootView;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent(getActivity(), AccelerometerActivity.class);
startActivity(intent);
}
}
这是加速度计布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/x_axis_Text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="none"
android:paddingLeft="50dp"
android:textColor="#0000FF"
android:background="#FFFFFF"
android:text="@string/x_axis_title"
android:textSize="@android:dimen/notification_large_icon_height" />
<TextView
android:id="@+id/y_axis_Text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="none"
android:paddingLeft="50dp"
android:textColor="#008800"
android:background="#FFFFFF"
android:text="@string/y_axis_title"
android:textSize="@android:dimen/notification_large_icon_height" />
<TextView
android:id="@+id/z_axis_Text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="none"
android:paddingLeft="50dp"
android:textColor="#FF0000"
android:background="#FFFFFF"
android:text="@string/z_axis_title"
android:textSize="@android:dimen/notification_large_icon_height" />
<com.androidplot.xy.XYPlot
android:id="@+id/dynamicPlot"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="#FFFFFF"
android:layout_weight="0.62"
title="@string/dynamic_plot" />
</LinearLayout>
这是加速度计activity（它从 Pebble Watch 获取数据）：
public class AccelerometerActivity extends Activity {
private static final String TAG = "SleepTracker";
// The tuple key corresponding to a vector received from the watch
private static final int PP_KEY_CMD = 128;
private static final int PP_KEY_X = 1;
private static final int PP_KEY_Y = 2;
private static final int PP_KEY_Z = 3;
@SuppressWarnings("unused")
private static final int PP_CMD_INVALID = 0;
private static final int PP_CMD_VECTOR = 1;
public static final int VECTOR_INDEX_X = 0;
public static final int VECTOR_INDEX_Y = 1;
public static final int VECTOR_INDEX_Z = 2;
private static int vector[] = new int[3];
private PebbleKit.PebbleDataReceiver dataReceiver;
// This UUID identifies the SleepTracker app.
private static final UUID SLEEPTRACKER_UUID = UUID.fromString("273761eb-97dc-4f08-b353-3384a2170902");
private static final int SAMPLE_SIZE = 30;
private XYPlot xyPlot = null;
SimpleXYSeries xSeries = null;
SimpleXYSeries ySeries = null;
SimpleXYSeries zSeries = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i(TAG, "onCreate: ");
setContentView(R.layout.activity_accelerometer);
vector[VECTOR_INDEX_X] = 0;
vector[VECTOR_INDEX_Y] = 0;
vector[VECTOR_INDEX_Z] = 0;
PebbleKit.startAppOnPebble(getApplicationContext(), SLEEPTRACKER_UUID);
xyPlot = (XYPlot) findViewById(R.id.dynamicPlot);
xyPlot.getGraphWidget().getBackgroundPaint().setColor(Color.WHITE);
xyPlot.getGraphWidget().getGridBackgroundPaint().setColor(Color.WHITE);
xyPlot.getGraphWidget().setDomainValueFormat(new DecimalFormat("0.0"));
xyPlot.getGraphWidget().setRangeValueFormat(new DecimalFormat("0"));
xyPlot.getGraphWidget().getDomainLabelPaint().setColor(Color.BLACK);
xyPlot.getGraphWidget().getRangeLabelPaint().setColor(Color.BLACK);
xyPlot.getGraphWidget().getDomainOriginLabelPaint().setColor(Color.BLACK);
xyPlot.getGraphWidget().getDomainOriginLinePaint().setColor(Color.BLACK);
xyPlot.getGraphWidget().getRangeOriginLinePaint().setColor(Color.BLACK);
xyPlot.setTicksPerDomainLabel(1);
xyPlot.setTicksPerRangeLabel(1);
xyPlot.getGraphWidget().getDomainLabelPaint().setTextSize(30);
xyPlot.getGraphWidget().getRangeLabelPaint().setTextSize(30);
xyPlot.getGraphWidget().setDomainLabelWidth(40);
xyPlot.getGraphWidget().setRangeLabelWidth(80);
xyPlot.setDomainLabel("time");
xyPlot.getDomainLabelWidget().pack();
xyPlot.setRangeLabel("G-force");
xyPlot.getRangeLabelWidget().pack();
xyPlot.setRangeBoundaries(-1024, 1024, BoundaryMode.FIXED);
xyPlot.setDomainBoundaries(0, SAMPLE_SIZE, BoundaryMode.FIXED);
xSeries = new SimpleXYSeries("X-axis");
xSeries.useImplicitXVals();
ySeries = new SimpleXYSeries("Y-axis");
ySeries.useImplicitXVals();
zSeries = new SimpleXYSeries("Z-axis");
zSeries.useImplicitXVals();
// Blue line for X axis.
LineAndPointFormatter fmtX = new LineAndPointFormatter(Color.BLUE, null, null, null);
xyPlot.addSeries(xSeries, fmtX);
// Green line for Y axis.
LineAndPointFormatter fmtY = new LineAndPointFormatter(Color.GREEN, null, null, null);
xyPlot.addSeries(ySeries, fmtY);
// Red line for Z axis.
LineAndPointFormatter fmtZ = new LineAndPointFormatter(Color.RED, null, null, null);
xyPlot.addSeries(zSeries, fmtZ);
}
@Override
public void onPause() {
super.onPause();
Log.i(TAG, "onPause: ");
setContentView(R.layout.activity_accelerometer);
if (dataReceiver != null) {
unregisterReceiver(dataReceiver);
dataReceiver = null;
}
PebbleKit.closeAppOnPebble(getApplicationContext(), SLEEPTRACKER_UUID);
}
@Override
public void onResume() {
super.onResume();
Log.i(TAG, "onResume: ");
final Handler handler = new Handler();
dataReceiver = new PebbleKit.PebbleDataReceiver(SLEEPTRACKER_UUID) {
@Override
public void receiveData(final Context context, final int transactionId, final PebbleDictionary dict) {
handler.post(new Runnable() {
@Override
public void run() {
PebbleKit.sendAckToPebble(context, transactionId);
final Long cmdValue = dict.getInteger(PP_KEY_CMD);
if (cmdValue == null) {
return;
}
if (cmdValue.intValue() == PP_CMD_VECTOR) {
// Capture the received vector.
final Long xValue = dict.getInteger(PP_KEY_X);
if (xValue != null) {
vector[VECTOR_INDEX_X] = xValue.intValue();
}
final Long yValue = dict.getInteger(PP_KEY_Y);
if (yValue != null) {
vector[VECTOR_INDEX_Y] = yValue.intValue();
}
final Long zValue = dict.getInteger(PP_KEY_Z);
if (zValue != null) {
vector[VECTOR_INDEX_Z] = zValue.intValue();
}
// Update the user interface.
updateUI();
}
}
});
}
};
PebbleKit.registerReceivedDataHandler(this, dataReceiver);
}
public void updateUI() {
final String x = String.format(Locale.getDefault(), "X: %d", vector[VECTOR_INDEX_X]);
final String y = String.format(Locale.getDefault(), "Y: %d", vector[VECTOR_INDEX_Y]);
final String z = String.format(Locale.getDefault(), "Z: %d", vector[VECTOR_INDEX_Z]);
// Update the numerical fields
TextView x_axis_tv = (TextView) findViewById(R.id.x_axis_Text);
x_axis_tv.setText(x);
TextView y_axis_tv = (TextView) findViewById(R.id.y_axis_Text);
y_axis_tv.setText(y);
TextView z_axis_tv = (TextView) findViewById(R.id.z_axis_Text);
z_axis_tv.setText(z);
// Update the Plot
// Remove oldest vector data.
if (xSeries.size() > SAMPLE_SIZE) {
xSeries.removeFirst();
ySeries.removeFirst();
zSeries.removeFirst();
}
// Add the latest vector data.
xSeries.addLast(null, vector[VECTOR_INDEX_X]);
ySeries.addLast(null, vector[VECTOR_INDEX_Y]);
zSeries.addLast(null, vector[VECTOR_INDEX_Z]);
// Redraw the Plots.
xyPlot.redraw();
}
}
这是 MainActivity：
public class MainActivity extends AppCompatActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
Fragment fragment = null;
if(position == 0){
fragment = new LogFragment();
}
if(position == 1){
fragment = new AccelerometerFragment();
}
return fragment;
}
@Override
public int getCount() {
// Show 2 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
}
return null;
}
}
}
如有任何帮助，我们将不胜感激！
How to create a fragment that inflates a activity layout and runs a activity on the fragment?
你没有。
Both activities seem to start at the same time because the app starts with the accelerometer activity and when the back button is pressed it goes to the tabbed activity
这正是您告诉 Android 要做的。您正在 AccelerometerFragment 的 onCreate() 中呼叫 startActivity()。正如方法名称所暗示的那样，startActivity() 启动了一个 activity。在这种情况下，您开始 AccelerometerActivity.
将业务逻辑从 AccelerometerActivity 移动到 AccelerometerFragment。然后，去掉AccelerometerFragment中的onCreate()。然后，要么：
完全摆脱
AccelerometerActivity，或者如果你想让加速度计的东西显示在
MainActivity和 中单独的 activity，有AccelerometerActivity显示它自己的实例AccelerometerFragment