在MainActivity中,我有一个TextView：textV1.我还在MainActivity中有一个方法来更新该文本视图：
public void updateTheTextView(final String t) {
MainActivity.this.runOnUiThread(new Runnable() {
public void run() {
TextView textV1 = (TextView) findViewById(R.id.textV1);
textV1.setText(t);
}
});
}
在BroadcasrReceiver中,我需要更新MainActivity中textV1中的文本.
public class NotifAlarm extends BroadcastReceiver {
@Override
public void onReceive(Context context,Intent intent) {
// other things done here like notification
// NEED TO UPDATE TEXTV1 IN MAINACTIVITY HERE
}
}
如何才能做到这一点？ BroadcastReceiver是从服务运行的.这段代码我不能改变.可以从onReceive()访问和更改MainActivity中的textV1吗？我尝试了许多事情,但都失败了.
解决方法
在MainActivity中,如下所示,初始化MainActivity类的变量.
public class MainActivity extends Activity {
private static MainActivity ins;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ins = this;
}
public static MainActivity getInstace(){
return ins;
}
public void updateTheTextView(final String t) {
MainActivity.this.runOnUiThread(new Runnable() {
public void run() {
TextView textV1 = (TextView) findViewById(R.id.textV1);
textV1.setText(t);
}
});
}
}
public class NotifAlarm extends BroadcastReceiver {
@Override
public void onReceive(Context context,Intent intent) {
try {
MainActivity .getInstace().updateTheTextView("String");
} catch (Exception e) {
}
}
}
