开发流程:
(1)发布广播信息(指明Action)
Button forceOffline = (Button) findViewById(R.id.force_offline);
forceOffline.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("com.example.broadcastbestpractice.FORCE_OFFLINE");
sendBroadcast(intent);
}
});
(2)注册recevicer和intent
protected void onResume() {
super.onResume();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("com.example.broadcastbestpractice.FORCE_OFFLINE");
receiver = new ForceOfflineReceiver();
registerReceiver(receiver, intentFilter);
}
(3) 重写onReceive()方法
class ForceOfflineReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, Intent intent) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Warning");
builder.setMessage("You are forced to be offline. Please try to login again.");
builder.setCancelable(false);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
ActivityCollector.finishAll(); // 销毁所有活动
Intent intent = new Intent(context, LoginActivity.class);
context.startActivity(intent); // 重新启动LoginActivity
}
});
builder.show();
}
}
(4) receiver退出注册
@Override
protected void onPause() {
super.onPause();
if (receiver != null) {
unregisterReceiver(receiver);
receiver = null;
}
}