Question

我必须将MainActivity.java的详细信息发送到另一个活动并在那里打印

我在mainActivity中创建了一个onclick事件，但是当我点击按钮时，应用程序在模拟器中崩溃并在logcat中获取异常

MainActivity.java

Button buy_button = (Button)convertView.findViewById(R.id.buy_global);
            buy_button.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                Context context;    
                    Intent intent = new Intent("com.coded.sandeep.Another");
                    intent.putExtra("message", "Hello From MainActivity");

                    Bundle extras = new Bundle();
                    extras.putString("status", "Data Received!");

                    intent.putExtras(extras);

                    context.startActivity(intent);

                }
            });

Another.java

public class Another extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.another);

        // 1. get passed intent 
        Intent intent = getIntent();

        // 2. get message value from intent
        String message = intent.getStringExtra("message");

        // 3. show message on textView 
        ((TextView)findViewById(R.id.tvMessage)).setText(message);



        // 5. get status value from bundle
        String status = bundle.getString("status");

        // 6. show status on Toast
        Toast toast = Toast.makeText(this, status, Toast.LENGTH_LONG);
        toast.show();
    }
}

logcat的

06-03 05:41:52.249: W/dalvikvm(1644): threadid=1: thread exiting with uncaught exception (group=0xb4a38ba8)
    06-03 05:41:52.379: E/AndroidRuntime(1644): FATAL EXCEPTION: main
    06-03 05:41:52.379: E/AndroidRuntime(1644): Process: com.coded.sandeep, PID: 1644
    06-03 05:41:52.379: E/AndroidRuntime(1644): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.coded.sandeep.Another (has extras) }
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1632)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1424)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.app.Activity.startActivityForResult(Activity.java:3424)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.app.Activity.startActivityForResult(Activity.java:3385)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.app.Activity.startActivity(Activity.java:3627)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.app.Activity.startActivity(Activity.java:3595)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at com.coded.sandeep.MusicDatabaseActivity$ImageAdapter$3.onClick(MusicDatabaseActivity.java:252)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.view.View.performClick(View.java:4438)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.view.View$PerformClick.run(View.java:18422)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.os.Handler.handleCallback(Handler.java:733)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.os.Handler.dispatchMessage(Handler.java:95)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.os.Looper.loop(Looper.java:136)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at android.app.ActivityThread.main(ActivityThread.java:5017)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at java.lang.reflect.Method.invokeNative(Native Method)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at java.lang.reflect.Method.invoke(Method.java:515)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
    06-03 05:41:52.379: E/AndroidRuntime(1644):     at dalvik.system.NativeStart.main(Native Method)

如果我改变任何东西，代码中是否有任何错误

Answer 1

替换Intent intent = new Intent("com.coded.sandeep.Another"); 与

Intent intent = new Intent(MainActivity.this, Another.class);

使用Intent("com.coded.sandeep.Another");创建意图会创建'com.coded.sandeep.Another'类型的意图。但是，由于这是一个自定义意图并且android不知道如何处理它，因此会生成异常。

编辑1：由于在单击侦听器内部，MainActivity.this实例不可用，请尝试：

Activity activity; //Instance variable

在OnCreate（）中：

activity = this;

然后使用Intent intent = new Intent(activity, Another.class);

编辑2：

由于这是在适配器内，并且您的适配器没有启动活动的上下文，因此您可以在初始化适配器时传递上下文，然后使用它来启动活动。

public class CustomAdapter extends BaseAdapter {

    Activity activity; 

    public CustomAdapter(Activity) {
        this.activity = activity;
    }

    //Now use this activity to create a new intent and start new activity inside your button click listener. 
}

Answer 2

尝试以下代码： -

更改以下代码

Intent intent = new Intent("com.coded.sandeep.Another");

到

Intent intent = new Intent(MainActivity.this,Another.class);

Answer 3

您需要像这样更改您的Intent代码。 Intent intent = new Intent（this，Another.class）;

Answer 4

替换此

Intent intent = new Intent("com.coded.sandeep.Another");

带

Intent intent = new Intent(MainActivity.this,Another.class);

MainActivity.this是来源 Another.class是目的地简单地说从（MainActivity）到（Another）

Answer 5

您也可以在 manifest.xml 中更改以下内容，而不是更改代码：

<activity
    android:name=".Another" >
    <intent-filter>
        <action android:name="com.coded.sandeep.Another" />
    </intent-filter>
</activity>

希望有所帮助：）

Android：将数据发送到另一个提供致命异常的Activity

5 个答案: