文本视图的可访问性

Question

我是 android 开发新手。我开始 android 辅助功能工作，以使 android 应用程序可供盲人使用。我制作了简单的登录表单并设置了可访问性属性，例如内容描述和焦点等我打开回话并检查它。

    here is code activity_main.xml
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="@string/usernm_text"
        android:id="@+id/username"
        android:contentDescription="@string/usernm_text"
        android:focusable="true"
        android:nextFocusDown="@+id/usr_nm"
         />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:ems="10"
        android:id="@+id/usr_nm"
        android:contentDescription="@string/usernm_text"
        android:focusable="true"
        android:text="admin"
        android:nextFocusDown="@+id/password"
        android:nextFocusUp="@id/usr_nm"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="@string/pass_text"
        android:id="@+id/password"
        android:focusable="true"
        android:nextFocusDown="@+id/pass_edit"
        android:contentDescription="@string/pass_text"
        android:nextFocusUp="@id/usr_nm"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/pass_edit"
        android:contentDescription="@string/pass_text"
        android:text="admin"
        android:focusable="true"
        android:nextFocusDown="@+id/login"
        android:nextFocusUp="@id/password"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/login_btn"
        android:onClick="log"
        android:id="@+id/login"
        android:contentDescription="@string/login_btn"
        android:focusable="true"
        android:nextFocusUp="@id/pass_edit"
        android:accessibilityLiveRegion="polite" />


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:id="@+id/log_succ"
        android:focusable="true"
        android:accessibilityLiveRegion="polite" />

</LinearLayout>

在我的 MainActivity.java

public class MainActivity extends AppCompatActivity {
    EditText usr_nm;
    TextView log_succ;
    Button logs;
    EditText pass_edit;
    int  counter=5;
    String log_msg="login successful";
    Button log_btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        log_succ=(TextView) findViewById(R.id.log_succ);
        usr_nm=(EditText) findViewById(R.id.usr_nm);
        pass_edit=(EditText)findViewById(R.id.pass_edit);



    }
    public  void  log(View view) {

        if (usr_nm.getText().toString().equals("admin") &&
                pass_edit.getText().toString().equals("admin")) {
            log_succ.setText(log_msg);
            log_succ.setContentDescription("Login successful");
//            log_succ.isFocusable();

//            Toast.makeText(MainActivity.this, "password is correct", Toast.LENGTH_LONG).show();
//            Intent in = new Intent("com.example.samir.login_form.user_page");
//            startActivity(in);


        } else {
            Toast.makeText(MainActivity.this, "password is incorrect", Toast.LENGTH_SHORT).show();
            counter--;
            if (counter == 0)
                logs.setEnabled(false);

        }
    }

点击后对讲提示登录成功textview。我希望当我点击登录按钮时，textview "Login successful" 应该立即通过对讲提示。我将 AccessibilityliveRegion 设置为 "polite"。我还应该做什么？？

Answer 1

据我了解，您希望系统在用户登录后说出 "Login Successful"。

您可以使用 TextToSpeech class.

来实现

先声明一个TextToSpeech的对象（一个Global/Class变量）：

TextToSpeech tts;

然后将其设置为实例化并在您的登录过程成功时说出：

tts = new TextToSpeech(getApplicationContext(), new TextToSpeech.OnInitListener() {
      @Override
      public void onInit(int status) {
          if(status == TextToSpeech.SUCCESS){
              tts.setLanguage(Locale.US);
              tts.speak("Login Successful", TextToSpeech.QUEUE_FLUSH, null);
          }
      }
  });

另外，完成后不要忘记释放资源：

@Override
protected void onPause() {
        if(tts!=null){
            tts.stop();
            tts.shutdown();
        }
        super.onPause();
}

希望这对您有所帮助。

Answer 2

如果我们为 textview 设置 android:accessibilityLiveRegion="polite" 这是可能的..谢谢您的回复。

文本视图的可访问性

accessibility on textview

android

accessibility