Question

我正在尝试以下列方式动态添加TextView。但是在我运行应用程序后无法看到我的新TextView。

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main2);
    TextView textView= (TextView) new TextView(this);
    textView.setText("Hello");
    textView.setBackgroundColor(0xff66ff66); // hex color 0xAARRGGBB
    textView.setPadding(20, 20, 20, 20);
    LinearLayout ll = (LinearLayout)findViewById(R.id.LinearLayout1);
    textView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));
    LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    ll.addView(textView);
    ViewGroup vg = (ViewGroup) findViewById (R.id.LinearLayout1);
    vg.invalidate();

    // ATTENTION: This was auto-generated to implement the App Indexing API.
    // See https://g.co/AppIndexing/AndroidStudio for more information.
    client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();

    databaseHelper = new DatabaseHelper(getBaseContext());
    try {
        databaseHelper.createDataBase();
    } catch (IOException e) {
        e.printStackTrace();
    }
    databaseHelper.openDataBase();

}

Answer 1

删除这些行

ViewGroup vg = (ViewGroup) findViewById (R.id.LinearLayout1);
vg.invalidate();

Answer 2

将textview添加到linearlayout后请求布局如下

ll.requestLayout();

Answer 3

LayoutParams lparams = new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
TextView tv=new TextView(this);
tv.setLayoutParams(lparams);
tv.setText("test");
this.linerLayout.addView(tv);

Answer 4

删除xml并重新创建它后工作。

动态地将TextView添加到Activity

4 个答案: