在 ConstraintLayout 中看不到我以编程方式添加的文本视图

Question

我在代码中的 ConstrainLayout 中添加了 2 个文本视图，但我看不到它们。屏幕是空的。请有人能帮我弄清楚这个吗？非常感谢！

public class ActivitySixth extends AppCompatActivity {
    private TextView tv1;
    private TextView tv3;
    private ConstraintLayout mConstraintLayout;
    private static final int ID_CONS_LAY = 160;
    private static final int ID_TV1 = 160;
    private static final int ID_TV3 = 160;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sixth);

        mConstraintLayout = findViewById(R.id.parent_Constraint);
        ConstraintSet set = new ConstraintSet();
        set.clone(mConstraintLayout);

        tv1 = new TextView(this);
        tv3 = new TextView(this);

       tv1.setText("TextView number ONE");
       tv3.setText("TextView number THREE");

       tv1.setId(ID_TV1);
       tv3.setId(ID_TV3);

       mConstraintLayout.addView(tv1);
       mConstraintLayout.addView(tv3);

       set.connect(tv1.getId(), ConstraintSet.LEFT, R.id.parent_Constraint, ConstraintSet.LEFT, 0);
       set.connect(tv3.getId(), ConstraintSet.RIGHT, R.id.parent_Constraint, ConstraintSet.RIGHT, 0);
       set.applyTo(mConstraintLayout);
}

}

Answer 1

您好，请按照下面的代码

        ConstraintLayout layout = (ConstraintLayout) findViewById(R.id.mainConstraint);
    ConstraintSet set = new ConstraintSet();

    ImageView view = new ImageView(this);
    layout.addView(view, 0);
    set.clone(layout);
    set.connect(view.getId(), ConstraintSet.TOP, layout.getId(), ConstraintSet.TOP, 60);
    set.applyTo(layout);

Answer 2

TextView contactUs = new TextView(this);
contactUs.setText(R.string.contactus);
contactUs.setTextSize(25);
contactUs.setId(R.id.contactUs);

ConstraintLayout.LayoutParams clpcontactUs = new ConstraintLayout.LayoutParams(
    ConstraintLayout.LayoutParams.WRAP_CONTENT, ConstraintLayout.LayoutParams.WRAP_CONTENT);
contactUs.setLayoutParams(clpcontactUs);

constraintLayout.addView(contactUs);

ConstraintSet set = new ConstraintSet();
set.clone(mConstraintLayout);

set.connect(tv1.getId(), ConstraintSet.LEFT, R.id.parent_Constraint, ConstraintSet.LEFT, 0);
set.connect(tv3.getId(), ConstraintSet.RIGHT, R.id.parent_Constraint, ConstraintSet.RIGHT, 0);
set.applyTo(mConstraintLayout);

试试这样的东西..

参考。 http://www.zoftino.com/adding-views-&-constraints-to-android-constraint-layout-programmatically

Answer 3

首先，IDs 应该不同，其次，您需要为 TextViews 添加约束' width/height:

    set.connect(tv1.getId(), ConstraintSet.LEFT, R.id.parent_Constraint, ConstraintSet.LEFT, 0);
    set.constrainWidth(tv1.getId(), WRAP_CONTENT);
    set.constrainHeight(tv1.getId(), WRAP_CONTENT);
    set.connect(tv3.getId(), ConstraintSet.RIGHT, R.id.parent_Constraint, ConstraintSet.RIGHT, 0);
    set.constrainWidth(tv3.getId(), WRAP_CONTENT);
    set.constrainHeight(tv3.getId(), WRAP_CONTENT);
    set.applyTo(mConstraintLayout);

顺便说一句，为了避免冲突，您可以使用资源定义ids xml。

在您的 res\values 文件夹中创建 ids.xml

定义 ID：

<resources>
    <item type="id" name="textView1" />
</resources>

使用定义的id:
```
R.id.textView1
```

在 ConstraintLayout 中看不到我以编程方式添加的文本视图

Can't see my programmatically added textviews in ConstraintLayout

android

android-constraintlayout