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我从数据库中得到了一些数据。无需将数据传递给 ShowData 活动即可完成所有操作。

bDBget.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                db.open();
                String data = db.getThat();
                db.close();
                Intent i = new Intent(getApplicationContext(), ShowData.class);
                i.putExtra("data", data);
                startActivity(i);
            }
        });

androidManifest 没有问题。问题可能是什么？

日志猫

10-12 17:05:35.248: D/gralloc_goldfish(1622): Emulator without GPU emulation detected.
10-12 17:05:46.658: I/Choreographer(1622): Skipped 33 frames!  The application may be doing too much work on its main thread.
10-12 17:05:48.549: D/AndroidRuntime(1622): Shutting down VM
10-12 17:05:48.568: W/dalvikvm(1622): threadid=1: thread exiting with uncaught exception (group=0x41465700)
10-12 17:05:49.298: D/dalvikvm(1622): GC_FOR_ALLOC freed 159K, 9% free 2858K/3136K, paused 236ms, total 297ms
10-12 17:05:49.298: E/AndroidRuntime(1622): FATAL EXCEPTION: main
10-12 17:05:49.298: E/AndroidRuntime(1622): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.channel/com.example.channel.ShowData}: java.lang.NullPointerException
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.os.Handler.dispatchMessage(Handler.java:99)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.os.Looper.loop(Looper.java:137)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.app.ActivityThread.main(ActivityThread.java:5103)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at java.lang.reflect.Method.invokeNative(Native Method)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at java.lang.reflect.Method.invoke(Method.java:525)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at dalvik.system.NativeStart.main(Native Method)
10-12 17:05:49.298: E/AndroidRuntime(1622): Caused by: java.lang.NullPointerException
10-12 17:05:49.298: E/AndroidRuntime(1622):     at com.example.channel.ShowData.onCreate(ShowData.java:21)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.app.Activity.performCreate(Activity.java:5133)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-12 17:05:49.298: E/AndroidRuntime(1622):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
10-12 17:05:49.298: E/AndroidRuntime(1622):     ... 11 more

ShowData 活动在这里。

protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.show);

        tvGeneral = (TextView) findViewById(R.layout.show);

        Bundle extras = getIntent().getExtras();
        String data = extras.getString("data");
        tvGeneral.setText(data);
    }

我现在真的无法理解 logcat 的任何内容。

4

1 回答 1

2 
tvGeneral = (TextView) findViewById(R.layout.show);

R.layout.show 不是视图，而是布局，这是不合法的。它应该是：

R.id.nameofview
于 2013-10-12T21:35:02.893 回答