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[操作系统]Android横竖屏切换小结


Android手机或平板都会存在横竖屏切换的功能,通常是由物理重力感应触发的,但是
有时候也不尽然,通常在设置里面我们可以对手机的横竖屏切换进行关闭。

AndroidManifest.

<activity
android:name="com.google.android.gms.ads.AdActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:theme="@android:style/Theme.Translucent" />
<?

  

activity_main.

<RelativeLayout  ="http://schemas.android.com/apk/res/android"  ="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  >  <Button    android:id="@+id/button"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="获取Configuration信息"    android:textSize="25sp"    android:layout_marginTop="80dip"    android:layout_centerHorizontal="true"    />  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="测试ConfigurationChange"    android:textSize="25sp"    android:layout_centerInParent="true"    android:id="@+id/mytext" /></RelativeLayout>

MainActivity.java

package com.example.yanlei.yl7;import android.content.res.Configuration;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends AppCompatActivity {  private Button mButton;  private TextView pTextView;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    pTextView=(TextView)this.findViewById(R.id.mytext);    System.out.println("---> onCreate()");    init();  }  private void init() {    mButton = (Button) findViewById(R.id.button);    mButton.setOnClickListener(new ClickListenerImpl());  }  private class ClickListenerImpl implements OnClickListener {    @Override    public void onClick(View v) {      getConfigurationInfo();    }  }  private void getConfigurationInfo() {    Configuration configuration = getResources().getConfiguration();    //获取屏幕方向    int l = configuration.ORIENTATION_LANDSCAPE;    int p = configuration.ORIENTATION_PORTRAIT;    if (configuration.orientation == l) {      pTextView.setText("现在是横屏====");      System.out.println("现在是横屏");    }    if (configuration.orientation == p) {      pTextView.setText("现在是竖屏===");      System.out.println("现在是竖屏");    }  }  @Override  public void onConfigurationChanged(Configuration newConfig) {    super.onConfigurationChanged(newConfig);    //newConfig.orientation获得当前屏幕状态是横向或者竖向    //Configuration.ORIENTATION_PORTRAIT 表示竖向    //Configuration.ORIENTATION_LANDSCAPE 表示横屏    if(newConfig.orientation==Configuration.ORIENTATION_PORTRAIT){      pTextView.setText("现在是竖屏");      Toast.makeText(MainActivity.this, "现在是竖屏", Toast.LENGTH_SHORT).show();    }    if(newConfig.orientation==Configuration.ORIENTATION_LANDSCAPE){      pTextView.setText("现在是横屏");      Toast.makeText(MainActivity.this, "现在是横屏", Toast.LENGTH_SHORT).show();    }  }  @Override  protected void onSaveInstanceState(Bundle outState) {    super.onSaveInstanceState(outState);    outState.putString("name", "zxx");    outState.putInt("id", 9527);    System.out.println("---> onSaveInstanceState()");  }  @Override  protected void onRestoreInstanceState(Bundle savedInstanceState) {    super.onRestoreInstanceState(savedInstanceState);    String name = savedInstanceState.getString("name");    int id = savedInstanceState.getInt("id");    System.out.println("---> onRestoreInstanceState()");    System.out.println("名字=" + name + ",编号=" + id);  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.menu_main, menu);    return true;  }  @Override  public boolean onOptionsItemSelected(MenuItem item) {    // Handle action bar item clicks here. The action bar will    // automatically handle clicks on the Home/Up button, so long    // as you specify a parent activity in AndroidManifest.    int id = item.getItemId();    if (id == R.id.action_settings) {      return true;    }    return super.onOptionsItemSelected(item);  }}