Android设备onConfigurationChanged事件不处理方向

时间:2012-11-16 06:11:23

标签: android configuration orientation landscape portrait

我有一个活动,在活动启动时我需要在lanscape中更改方向,然后我想在用户旋转设备时处理两个方向更改,但是一旦改变了方向,稍后就不会改变取向。这是我的代码请帮助

    public class Hls extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_hls);

    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);


}



@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);

    Log.v("new orientation", "yes");

    if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT)
    {
        Toast.makeText(this, "portrait", Toast.LENGTH_LONG).show();
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
    {
        Toast.makeText(this, "landscape", Toast.LENGTH_LONG).show();
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    } 

}

3 个答案:

答案 0 :(得分:6)

在onCreate中使用setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)会将您的方向永久固定为横向,并避免方向发生任何变化。这就是为什么你的方向得到修复而不响应轮换的原因。

您可以使用以下选项: -

1>在布局中创建两个视图。即一个用于横向,一个用于纵向视图。让我们说activity_hls_land和activity_hls_port。

2 - ;在onConfigurationChanged(配置newConfig)中使用 setContentView(R.layout.activity_hls)而不是setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)或setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT)

以下是示例代码: -

 public class MainActivity extends Activity {
boolean isLaunched=true;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        if(isLaunched){
        Toast.makeText(this, "1 st launch " , Toast.LENGTH_SHORT).show(); 
        setContentView(R.layout.activity_hls_land);
        }

    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);

    if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT)
    {
        Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
        setContentView(R.layout.activity_hls_port);
    }
     if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
    {
        Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
        setContentView(R.layout.activity_hls_land );
    } 
    }

}

并在清单中在活动中添加android:configChanges =“orientation”: -

<activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" 
            android:configChanges="orientation"
            >

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
          </activity>

activity_hls_port的示例布局: -

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
 <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
  <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
</LinearLayout>

横向模式示例: -

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:orientation="vertical"
    android:rotation="90">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
 <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
  <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
</LinearLayout>

答案 1 :(得分:1)

在此声明中

if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT)
    {
        Toast.makeText(this, "portrait", Toast.LENGTH_LONG).show();
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
    {
        Toast.makeText(this, "landscape", Toast.LENGTH_LONG).show();
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    } 

也在onCreate(Bundle bundle);

您致电

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

这意味着您的活动处于横向/纵向方向,从不再旋转

删除它会再次触发onConfigurationChanged(Configuration)

答案 2 :(得分:0)

我不清楚你的要求。如果您不介意重新启动活动,则可以跳过覆盖onConfigurationChanged。系统将为您处理方向更改。如果您不希望在方向更改时重新启动它,只需提及<activity android:configChanges="keyboardHidden|orientation|screenSize"/>,然后覆盖onConfigurationChanged并致电setContentView()

public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    setContentview(R.layout.activity_hls);
    initializeViews();//here you can initialize all your memberVariables using findViewbyID()
}