以编程方式向布局添加多个自定义视图

Question

例如,如果我有这样的空布局:

layout1.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

</LinearLayout>

以及其他一些布局:

layout2.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView 1" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button 2" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button 3" 
        android:layout_weight="1"/>

</LinearLayout>

我想layout2.xml以layout1.xml编程方式添加.我需要有多个不同的版本layout2.xml,我会在需要时添加.每个文本在TextView和Buttons上都有不同的文本.

在常规Android View的情况下,我通常会像这样做addView:

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

    TextView tv1 = new TextView(this);
    tv1.setText("HELLO");
    my_linear_layout.addView(tv1);

    Button btn2 = new Button(this);
    bt2.setText("WORLD");
    my_linear_layout.addView(btn2);
}

如果我没有像TextView或Button这样简单的东西,并且我有自己的xml定义View,我怎么能这样做呢？

是否有可能以某种方式将所有视图放在适配器中,就像ListView一样,然后在需要时获取它并只调用addView那些视图？

Answer 1

您可以膨胀layout2.xml文件,编辑文本,并将其添加到第一个布局:

public class MyActivity extends Activity {

    private ViewGroup mLinearLayout; 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout1);
        mLinearLayout = (ViewGroup) findViewById(R.id.linear_layout);
        addLayout("This is text 1", "This is first button", "This is second Button");
    }

    private void addLayout(String textViewText, String buttonText1, String buttonText2) {
        View layout2 = LayoutInflater.from(this).inflate(R.layout.layout2, mLinearLayout, false);

        TextView textView = (TextView) layout2.findViewById(R.id.button1);
        Button button1 = (Button) layout2.findViewById(R.id.button2); 
        Button button2 = (Button) layout2.findViewById(R.id.button3);

        textView1.setText(textViewText);
        button1.setText(buttonText1);
        button2.setText(buttonText2);

        mLinearLayout.addView(layout2);
    }
}

您可能希望android:layout_height将layout2.xml根视图更改为wrap_content.

Answer 2

layout1包含ScrollView作为父布局,主要LinearLayout作为子项,如果没有行项目更多屏幕大小ScrollView句柄溢出项目与滚动:

layout1.xml

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/my_linear_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

    </LinearLayout>
</ScrollView>

使用LayoutInflater在父LinearLayout中添加行项:

private LinearLayout my_linear_layout;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout1);
    my_linear_layout = (LinearLayout) findViewById(R.id.my_linear_layout);

    for(int i=1;i<=5;i++){
        View view = LayoutInflater.from(this).inflate(R.layout.layout2,null);
        TextView button1 = (TextView) view.findViewById(R.id.button1);
        Button button2 = (Button) view.findViewById(R.id.button2);
        TextView button3 = (TextView) view.findViewById(R.id.button3);

        button1.setText("HELLO " + i);
        button2.setText("HELLO "+i);
        button3.setText("HELLO "+i);
        my_linear_layout.addView(view);
    }
}

Answer 3

试试这个方法

添加id到LinearLayout“layout1.xml”：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/firstlayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

</LinearLayout>

在onCreate：

LinearLayout firstlayout = (LinearLayout) findViewById(R.id.firstlayout);

LinearLayout secondlayoout = (LinearLayout) this.getLayoutInflater().inflate(R.layout.layout2, null); // inflating view from xml
TextView btn1 = (TextView) secondlayoout.findViewById(R.id.button1);
btn1.setText("TEST");

firstlayout.addView(secondlayoout);