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サービスからアクティビティを開始できなかったという問題に直面しています。サービスがデータを受信して​​いるとき、handler.sendEmptyMessage(0)ハンドラー メッセージを送信するために呼び出します。その後、受信者は新しいアクティビティを開始します。しかし、今では活動を開始できません。誰かが以下のコードを読んで、私にいくつかの提案をしてもらえますか?

package com.testBlueTooth;

import java.io.InputStream;
import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.provider.SyncStateContract.Constants;
import android.util.Log;
import android.view.SurfaceView;
import android.widget.Toast;

public class ClsWaveDiagram extends Service{

private boolean isRecording = false;
private InputStream btInput = null;

public int rateX = 1;

public int rateY = 1;

public int baseLine = 0;

public ClsWaveDiagram(InputStream btInput, int rateX, int rateY,
        int baseLine) {
    this.btInput = btInput;
    this.rateX = rateX;
    this.rateY = rateY;
    this.baseLine = baseLine;
}


public void Start(SurfaceView sfv, Paint mPaint, int wait) {
    isRecording = true;
    new DrawThread(sfv, mPaint, wait).start();
}

public void Stop() {
    isRecording = false;
}


class DrawThread extends Thread {

    private int oldX = 0;
    private int oldY = 0;
    private SurfaceView sfv;
    private int X_index = 0;
    private Paint mPaint;
    private int wait = 50;

    public DrawThread(SurfaceView sfv, Paint mPaint, int wait) {
        this.sfv = sfv;
        this.mPaint = mPaint;
        this.wait = wait;
    }

    public void run() {
        while (isRecording) {
            try {

                byte[] temp = new byte[1024];

                int len = btInput.read(temp);
                Log.e("available", String.valueOf(len));

                System.out.println("alarm!");

                handler.sendEmptyMessage(0);

                if (len > 0) {
                    byte[] btBuf = new byte[len];
                    System.arraycopy(temp, 0, btBuf, 0, btBuf.length);
                    SimpleDraw(X_index, btBuf, rateX, rateY, baseLine);
                    X_index = X_index + (btBuf.length/rateX) - 1;
                    if (X_index > sfv.getHeight()) {
                        X_index = 0;
                    }
                }
                Thread.sleep(wait);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    }   



    void SimpleDraw(int start, byte[] inputBuf, int rateX, int rateY,
            int baseLine) {
        if (start == 0)
            oldX = 0;

        byte[] buffer = new byte[inputBuf.length / rateX];
        for (int i = 0, ii = 0; i < buffer.length; i++, ii = i * rateX)
            buffer[i] = inputBuf[ii];

        Canvas canvas = sfv.getHolder().lockCanvas(
                new Rect(0, start, sfv.getWidth(), start + buffer.length));
        canvas.drawColor(Color.BLACK);

        for (int i = 0; i < buffer.length; i++) {
            int y = i + start;
            int x = (0xFF - (buffer[i] & 0xFF))

                    / rateY + baseLine;
            canvas.drawLine(oldX, oldY, x, y, mPaint);
            oldX = x;
            oldY = y;
        }
        sfv.getHolder().unlockCanvasAndPost(canvas);
    }
}
private Handler handler = new Handler(){
    public void handleMessage(android.os.Message msg) {
        Intent intent = new Intent();


        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        intent.setClass(ClsWaveDiagram.this.getApplicationContext(), AlertActivity.class);


        ClsWaveDiagram.this.startActivity(intent);

    };};

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}

}

logcat エラーは以下のとおりです。

04-16 12:34:50.559: D/AndroidRuntime(3706): Shutting down VM
04-16 12:34:50.559: W/dalvikvm(3706): threadid=3: thread exiting with uncaught     exception (group=0x4001b170)
04-16 12:34:50.559: E/AndroidRuntime(3706): Uncaught handler: thread main exiting due     to uncaught exception
04-16 12:34:50.559: E/AndroidRuntime(3706): java.lang.NullPointerException
04-16 12:34:50.559: E/AndroidRuntime(3706):     at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:100)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at com.testBlueTooth.ClsWaveDiagram$1.handleMessage(ClsWaveDiagram.java:199)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at android.os.Looper.loop(Looper.java:123)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at android.app.ActivityThread.main(ActivityThread.java:4363)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at java.lang.reflect.Method.invokeNative(Native Method)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at java.lang.reflect.Method.invoke(Method.java:521)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
04-16 12:34:50.559: E/AndroidRuntime(3706):     at dalvik.system.NativeStart.main(Native Method)
04-16 12:34:50.590: I/dalvikvm(3706): threadid=7: reacting to signal 3
04-16 12:34:50.614: I/dalvikvm(3706): Wrote stack trace to '/data/anr/traces.txt'
04-16 12:34:54.789: E/available(3706): 2
04-16 12:34:54.789: I/System.out(3706): alarm!
04-16 12:34:54.903: E/available(3706): 20
04-16 12:34:54.903: I/System.out(3706): alarm!
04-16 12:34:59.034: E/available(3706): 1
04-16 12:34:59.034: I/System.out(3706): alarm!

主な活動：

package com.testBlueTooth;

import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;

public class WaveDiagram extends Activity {
ClsWaveDiagram clsWaveDiagram;
SurfaceView sfvWave;
Paint mPaint;
InputStream btInput;
Context context = WaveDiagram.this;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.wavediagram);

    sfvWave = (SurfaceView) this.findViewById(R.id.sfvWave);
    sfvWave.setOnTouchListener(new TouchEvent());

    mPaint = new Paint();
    mPaint.setColor(Color.GREEN);
    mPaint.setStrokeWidth(2);

    try {
        if (testBlueTooth.btSocket.getInputStream() != null) {
            clsWaveDiagram = new ClsWaveDiagram(
                    testBlueTooth.btSocket.getInputStream(),
                    3,
                    1,
                    sfvWave.getWidth()/2);

            clsWaveDiagram.Start(sfvWave, mPaint,80);
            Log.e("clsWaveDiagram","start");

        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

@Override
public void onDestroy()  
{  
    clsWaveDiagram.Stop();
    try {
        testBlueTooth.btSocket.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    super.onDestroy();  
}
class TouchEvent implements OnTouchListener {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        clsWaveDiagram.baseLine = (int) event.getX();
        return true;
    }

}
}
4

3 に答える 3

1

これを試してみてください。

Intent intent = new Intent(this.ctx, AlertActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

this.ctx.startActivity(intent);

ここにリンク

標準サービスコードはこちら

于 2012-05-09T06:33:13.710 に答える
0

DrawThread前に実行しないでくださいService.onStartCommand()

于 2012-05-09T06:23:09.363 に答える
0

ハンドラー関数では、blowとtryのように変更するだけです。

Intent intent = new Intent(ClsWaveDiagram.this, AlertActivity.class);

        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        ClsWaveDiagram.this.startActivity(intent);

これはあなたを助けると思います。

于 2012-05-09T06:26:13.310 に答える