Java 在BroadcastReceiver对象的OnReceive（）中修改绘图

如果您能帮助我解决以下问题，我将不胜感激

public class MyActivity extends Activity{

    XYPlot plot;
    BroadcastReceiver receiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        // Init plot.
        plot = (XYPlot) findViewById(R.id.plotView);
        // configure plot to heart's desire.
        // add XYSeries object to plot.
        // plot looks fine after activity has finished onCreate().


        // Init receiver
        receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                Log.d("Yay", "onReceived called"); // Appears on LogCat.
                plot.setTitle("A Happy Plot"); // Doesn't take effect.
            }
        }

        registerReceiver(receiver, new IntentFilter(MyIntentService.NOTIFICATION));
    }



}

Activity类中的XYPlot成员变量似乎没有响应从所述Activity的BroadcastReceiver成员变量调用的方法调用

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感谢您的帮助。

更改标题后，您似乎没有重新绘制情节。试试这个：

@Override
public void onReceive(Context context, Intent intent) {
    Log.d("Yay", "onReceived called"); // Appears on LogCat.
    plot.setTitle("A Happy Plot"); // Doesn't take effect.
    plot.redraw();
}

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尝试在

onReceive

方法中添加

plot

的初始化我已尝试在onReceive方法中初始化plot。这并不能解决问题。