Android 中 获取“back”键和“home”键,并为此附加功能
16lz
2021-01-23
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_HOME ) {
showDialog(0);
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
protected Dialog onCreateDialog(int id) {
return new AlertDialog.Builder(this).setTitle(R.string.base_title)
.setPositiveButton(R.string.base_pos,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
BaseApplication appState = (BaseApplication)BaseActivity.this.getApplication();
appState.stopService();
int pid = android.os.Process.myPid();
android.os.Process.killProcess(pid);
}
}).setNegativeButton(R.string.base_neg,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
}
}).create();
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_HOME ) {
showDialog(0);
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
protected Dialog onCreateDialog(int id) {
return new AlertDialog.Builder(this).setTitle(R.string.base_title)
.setPositiveButton(R.string.base_pos,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
BaseApplication appState = (BaseApplication)BaseActivity.this.getApplication();
appState.stopService();
int pid = android.os.Process.myPid();
android.os.Process.killProcess(pid);
}
}).setNegativeButton(R.string.base_neg,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
}
}).create();
}
而对于Android 2.0开始又多出了一种新的方法,对于Activity 可以单独获取Back键的按下事件,直接重写onBackPressed方法即可,代码如下
@Override
public void onBackPressed() {
// 这里处理逻辑代码,大家注意:该方法仅适用于2.0或更新版的sdk
return;
}
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