像微信、QQ一样，按返回键只是切activity到后台

最新推荐文章于 2019-07-26 11:47:09 发布

原创最新推荐文章于 2019-07-26 11:47:09 发布 · 676 阅读

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#Android #Java #切后台 #activity

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本文提供了两种启动Android设备上Home Activity的方法。第一种方法是通过Intent直接启动；第二种方法是通过PackageManager获取Home Activity信息后再启动，同时增加了异常处理确保操作的安全性。

Intent intent = new Intent(Intent.ACTION_MAIN);  
intent.addCategory(Intent.CATEGORY_HOME);  
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
startActivity(intent);

或者

PackageManager pm = getPackageManager();
ResolveInfo homeInfo = pm.resolveActivity(new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME), 0);
ActivityInfo ai = homeInfo.activityInfo;  
Intent startIntent = new Intent(Intent.ACTION_MAIN);  
startIntent.addCategory(Intent.CATEGORY_LAUNCHER);  
startIntent.setComponent(new ComponentName(ai.packageName,  ai.name));  
startActivitySafely(startIntent); 
void startActivitySafely(Intent intent) {
   intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
   try {
       startActivity(intent);
   } catch (ActivityNotFoundException e) {
       Toast.makeText(this, "unabletoopensoftware",Toast.LENGTH_SHORT).show();
   } catch (SecurityException e) {
       Toast.makeText(this, "unabletoopensoftware",
       Toast.LENGTH_SHORT).show();
       Log.e(TAG,"Launcher does not have the permission to launch "
                                    + intent
                                    + ". Make sure to create a MAIN intent-filter for the corresponding activity "
                                    + "or use the exported attribute for this activity.",
             e);
   }
}

两种方法。