//返回键处理
Android 改写返回键事件监听,使得back键功能类似home键,让Acitivty退至后台时不被系统销毁
现在很多程序要求back键不是退出程序而是像home键一样让Acitivty退至后台时不被系统销毁,查到的资料大多说都是继承activity的没有继承TabActivity,
TabActivity和activity不能一样处理,废话不多说了上代码。
继承activity的
/**
* 返回监听
*/
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO 监听返回键,相当于点击home键
PackageManager pm = getPackageManager();
ResolveInfo homeInfo = pm.resolveActivity(
new Intent(Intent.ACTION_MAIN)
.addCategory(Intent.CATEGORY_HOME), 0);
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);
}
继承TabActivity的
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
PackageManager pm = getPackageManager();
ResolveInfo homeInfo = pm.resolveActivity(
new Intent(Intent.ACTION_MAIN)
.addCategory(Intent.CATEGORY_HOME), 0);
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK
&& event.getAction() == KeyEvent.ACTION_DOWN) {
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 false;
}
return super.dispatchKeyEvent(event);
}
private void startActivitySafely(Intent intent) {
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(this, "ActivityNotFoundExceptionnull",
Toast.LENGTH_SHORT).show();
} catch (SecurityException e) {
Toast.makeText(this, "SecurityExceptionnull", Toast.LENGTH_SHORT)
.show();
}
}
返回键处理,back键功能类似home键
版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/wdx_1136346879/article/details/78977264
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转载自blog.csdn.net/wdx_1136346879/article/details/78977264
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