android：將視圖添加到膨脹的視圖中

Question

我想從res / layout目錄中擴展一個布局，並在我的activity類中添加一些視圖。

我的布局xml文件：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_marginTop="30dip"
    android:layout_height="fill_parent" >

    <Button
        android:id="@+id/reg_button"
        style="@style/simple_button"
        android:onClick="clickButton"
        android:text="@string/reg_button" />


    <!--  I WANT TO PUT CONTENT HERE ! -->

</LinearLayout>

在我的java代碼中，我嘗試膨脹上面的布局並添加一個帶有Button的linearLayout。

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    mContext = getApplicationContext();

    //inflate xml
    LinearLayout mainLayout = (LinearLayout)     LayoutInflater.from(getBaseContext()).inflate(R.layout.regions_search, null);


    //Create a new LinearLayout
    LinearLayout newLinear = new LinearLayout(mContext);        
    newLinear.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));

    //create  a new Button
    Button test = new Button(mContext);
    test.setText("My button");

    //first , I add button to the LinearLayout
    newLinear.addView(test);

    //Then, I add layout to the inflated layout
    mainLayout.addView(newLinear);


    //display
    setContentView(mainLayout);

但是新的線性視圖（及其子視圖）沒有顯示出來。

Answer 1

在你的活動中使用它，

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

    // display
    setContentView(R.layout.activity_main);

    Context mContext = getApplicationContext();
    LinearLayout mainLayout = (LinearLayout) findViewById(R.id.regions_search);
    // Create a new LinearLayout
    LinearLayout newLinear = new LinearLayout(mContext);
    newLinear.setLayoutParams(new LinearLayout.LayoutParams(
            LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

    // create a new Button
    Button test = new Button(mContext);
    test.setText("My button");

    // first , I add button to the LinearLayout
    newLinear.addView(test);

    // Then, I add layout to the inflated layout
    mainLayout.addView(newLinear);
}

並在您的xml文件（activity_main.xml）中寫入如下所示，

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/regions_search"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginTop="30dip" 
android:orientation="vertical">

<Button
    android:id="@+id/reg_button"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:onClick="clickButton"
    android:text="RegButton" />

<!-- I WANT TO PUT CONTENT HERE ! -->

</LinearLayout>

試試這個它將100％工作。

Answer 2

您可以嘗試為新添加的LinearLayout和Button添加寬度和高度參數嗎？ 創建視圖時需要這些參數。

像這樣。

newLinear.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

Answer 3

test.setLayoutParams（new LinearLayout.LayoutParams（LayoutParams.LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT，1f））;

評論行

的setContentView（mainLayout）;