Android 实现Activity后台运行

拦截返回键启动Home Activity

最新推荐文章于 2024-06-13 15:37:22 发布

原创最新推荐文章于 2024-06-13 15:37:22 发布 · 153 阅读

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本文介绍了一种方法，通过重写onKeyDown方法来监听并处理BACK按键事件，实现当按下返回键时启动指定的Home Activity。这种方法适用于需要自定义应用退出行为或进行特殊处理的应用场景。

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		PackageManager pm = getPackageManager();
                                ResolveInfo homeInfo = pm.resolveActivity(new Intent(Intent.ACTION_MAIN)
		.addCategory(Intent.CATEGORY_HOME), 0);

	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			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);
			return true;
		} else
			return super.onKeyDown(keyCode, event);
	}

	void startActivitySafely(Intent intent) {
		intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
		try {
			startActivity(intent);
		} catch (ActivityNotFoundException e) {
			Toast.makeText(this, R.string.unabletoopensoftware,
					Toast.LENGTH_SHORT).show();
		} catch (SecurityException e) {
			Toast.makeText(this, R.string.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);
		}
	}