Question

我知道停止方法已被弃用，我现在正在使用destroy方法，但是我收到了这个错误：

 11-09 11:42:28.740: E/AndroidRuntime(1538): FATAL EXCEPTION: main
11-09 11:42:28.740: E/AndroidRuntime(1538): java.lang.NoSuchMethodError: Thread.destroy()
11-09 11:42:28.740: E/AndroidRuntime(1538):     at java.lang.Thread.destroy(Thread.java:600)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at com.rathbones.src.NewslettersActivity.onKeyDown(NewslettersActivity.java:144)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at android.view.KeyEvent.dispatch(KeyEvent.java:1037)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at android.app.Activity.dispatchKeyEvent(Activity.java:2068)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1643)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2471)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2441)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1735)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at android.os.Looper.loop(Looper.java:123)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at android.app.ActivityThread.main(ActivityThread.java:4627)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at java.lang.reflect.Method.invokeNative(Native Method)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at java.lang.reflect.Method.invoke(Method.java:521)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-09 11:42:28.740: E/AndroidRuntime(1538):     at dalvik.system.NativeStart.main(Native Method)
11-09 11:42:28.760: W/ActivityManager(59):   Force finishing activity com.rathbones.src/.NewslettersActivity

但是应用程序没有崩溃，只是我在logcat中得到了这个错误。实际上我有一个时事通讯模块，它允许用户查看pdf文件，当他们按下视图按钮时它打开一个进度条，同时如果有人按下后退按钮它应该停止线程并优雅地退出。它做到了，但在日志猫我得到上述错误。以下是导致此错误的代码段：

private void viewOnline() {

        if (currentNewsletter == null) {
            Log.e(Constants.APP_NAME, "No newsletter selected");
            return;
        }

        final ProgressDialog d = new ProgressDialog(this);
        d.setMessage("Downloading...");
        d.show();

        final Context context = getApplicationContext();
         t = new Thread(new Runnable() {
            public void run() {

                String fileName = currentNewsletter.mFilename;

                Log.d(Constants.APP_NAME, "Downloading/showing: " + fileName);
                final File file = Utilities.getFileFromURL(context, currentNewsletter.mUrl, currentNewsletter.mExpectedSizeInBytes, fileName, false);

                d.dismiss();
                // Now we can show the file
                viewPDF(file);
            }
        });
        t.start();

        // Utilities.List(getApplicationContext().getFilesDir().getPath());
        // Utilities.List(getApplicationContext().getDir("files", Context.MODE_WORLD_WRITEABLE).getAbsolutePath());
        // Utilities.DeleteDirectory(getApplicationContext().getDir("files", Context.MODE_WORLD_WRITEABLE).getAbsolutePath());

    }

    private void viewPDF(File file) {

        //DEBUG DEBUG DEBUG
        //Log.d(Constants.APP_NAME, "ViewPDF: showing " + file.getName());
        //Log.d(Constants.APP_NAME, "Path: " + file.getPath());
        //Log.d(Constants.APP_NAME, "Exists: " + file.exists());
        //Log.d(Constants.APP_NAME, "Length: " + file.length());
        //DEBUG DEBUG DEBUG

        // Now it's all safe and sound and local, open it
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(file), "application/pdf");

        try {
            startActivity(intent);
        } catch (Exception e) {
            Toast.makeText(this, "No Application Available to View PDF", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onStop() {
        finish();
        super.onStop();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            t.destroy();
           Intent i = new Intent(NewslettersActivity.this,MainMenuActivity.class);

           startActivity(i);
           finish();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

Answer 1

如果你的内部有while loop的帖子，你可以用boolean flag来控制这个帖子的while条件。当您设置flag to false 主题完成其任务时。

编辑：小例子，

boolean flag = true;
Thread secondary = new Thread(new Runnable() {

@Override
public void run() {
    while (flag) {
    // do something
    }
 }
});

secondary.start(); //start the thread
flag = false; // this will force secondary to finish its execution
 try {
   secondary.join(); // wait for secondary to finish
   } catch (InterruptedException e) {
    throw new RuntimeException(e);
}

我会在SO中找到这个代码，它也适用于我。

Answer 2

使用中断而不是销毁。

Answer 3

对于user370305回答，可能有2个更改可能会有所帮助：

1）使用AtomicBoolean代替布尔值，如果线程在另一个核心中运行，则标志无法看到更改。

2）删除捕获中的throw new RuntimeException(e)。当你抛出异常时它会崩溃。

android如何停止或销毁线程？

3 个答案: