android - 如何解决 "No Activity found to handle Intent"错误

Question

android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.android.suven.Create_memo }

我只想从一项 Activity 转到另一项 Activity ，但它给了我这个错误。

我的主要 Activity 代码如下

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    btn1 = (Button)findViewById(R.id.button1);
    btn1.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) 
        {
            try
            {
                Intent i=new Intent("com.android.suven.Create_memo");
            startActivity(i);
            }
            catch ( ActivityNotFoundException e) {
                e.printStackTrace();
            }

        }

    });  
    btn2 = (Button)findViewById(R.id.button2);
    btn2.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) 
        {
            try
            {
                Intent i=new Intent("com.android.suven.Create_memo");
            startActivity(i);
            }
            catch ( ActivityNotFoundException e) {
                e.printStackTrace();
            }

    });          
  }
}

我的logcat是这样的:

06-05 13:43:35.959: E/AndroidRuntime(275): FATAL EXCEPTION: main
06-05 13:43:35.959: E/AndroidRuntime(275): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.suven/com.android.suven.Create_memo}: java.lang.NullPointerException
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.os.Looper.loop(Looper.java:123)
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.app.ActivityThread.main(ActivityThread.java:4627)
06-05 13:43:35.959: E/AndroidRuntime(275):  at java.lang.reflect.Method.invokeNative(Native Method)
06-05 13:43:35.959: E/AndroidRuntime(275):  at java.lang.reflect.Method.invoke(Method.java:521)
06-05 13:43:35.959: E/AndroidRuntime(275):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-05 13:43:35.959: E/AndroidRuntime(275):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-05 13:43:35.959: E/AndroidRuntime(275):  at dalvik.system.NativeStart.main(Native Method)
06-05 13:43:35.959: E/AndroidRuntime(275): Caused by: java.lang.NullPointerException
06-05 13:43:35.959: E/AndroidRuntime(275):  at com.android.suven.Create_memo.onCreate(Create_memo.java:56)
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-05 13:43:35.959: E/AndroidRuntime(275):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-05 13:43:35.959: E/AndroidRuntime(275):  ... 11 more
06-05 13:43:39.199: I/Process(275): Sending signal. PID: 275 SIG: 9

Answer 1

在你的代码行中

Intent i=new Intent("com.android.suven.Create_memo");

“com.android.suven.Create_memo” 被视为 ACTION。

相反，你必须把

Intent i=new Intent(YourCurrentAivityName.this, Create_memo.class);

也放

<activity
            android:name=".Create_memo" >
        </activity>

在您的 AndroidManifest.xml 文件中。