startActivity使应用程序强制关闭

时间:2011-07-18 17:56:27

标签: java android

我刚开始使用Android开发,我坚持使用此代码:

public class Home extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);
        Button buttonFoo = (Button)findViewById(R.id.buttonFoo);
        buttonFoo.setOnClickListener(openFoo);
    }

    public OnClickListener openFoo = new OnClickListener() {
        public void onClick(View v) {
            Intent intent = new Intent(Home.this, Foo.class);
            startActivity(intent);
        }
    };
}

以下是活动代码Foo:

public class Foo extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //populateWithLatest();
    }
}

错误日志:

07-18 19:53:35.043: ERROR/AndroidRuntime(4656): FATAL EXCEPTION: main
07-18 19:53:35.043: ERROR/AndroidRuntime(4656): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.github.progval.openquote/com.github.progval.openquote.sites.FooActivity}; have you declared this activity in your AndroidManifest.xml?
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.app.Activity.startActivityForResult(Activity.java:2827)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.app.Activity.startActivity(Activity.java:2933)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at com.github.progval.openquote.Home$1.onClick(Home.java:34)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.view.View.performClick(View.java:2501)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.view.View$PerformClick.run(View.java:9107)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.os.Handler.handleCallback(Handler.java:587)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.os.Looper.loop(Looper.java:130)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at android.app.ActivityThread.main(ActivityThread.java:3835)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at java.lang.reflect.Method.invokeNative(Native Method)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at java.lang.reflect.Method.invoke(Method.java:507)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
07-18 19:53:35.043: ERROR/AndroidRuntime(4656):     at dalvik.system.NativeStart.main(Native Method)

除非我对该行startActivity(intent);发表评论,否则当我按下Foo按钮时,app force会关闭。

5 个答案:

答案 0 :(得分:7)

<application android:label="@string/app_name" android:icon="@drawable/icon">
    <activity android:name=".Home"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

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

这是我最喜欢的部分:

07-18 19:53:35.043:ERROR / AndroidRuntime(4656):android.content.ActivityNotFoundException:无法找到显式活动类{com.github.progval.openquote / com.github.progval.openquote.sites。 VdmActivity}; 您是否在AndroidManifest.xml中声明了此活动?

我不知道这是否是实现按钮的最佳方式,但这是我如何做到的:

findViewById(R.id.buttonFoo).setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        Intent i = new Intent(v.getContext(), Foo.class);
        startActivity(i);
    }
});

答案 1 :(得分:1)

查看您的清单文件。您没有在那里签署Foo活动。在主要活动标记

put&lt;活动android:name =“。Foo”&gt;&lt; /活性GT;

答案 2 :(得分:0)

需要在清单文件中声明所有活动。先检查一下。

答案 3 :(得分:0)

实现OnClickListener时,它更容易,代码看起来会更好。因此,您只需添加方法onClick(View v)。作为onClickListener的上下文设置'this'以及intent的上下文。请参阅下面的代码。通常,这将有效。

public class Home extends Activity implements OnClickListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);
        Button buttonFoo = (Button)findViewById(R.id.buttonFoo);
        buttonFoo.setOnClickListener(this);
    }

    public void onClick(View v) {
        Intent intent = new Intent(this, Foo.class);
        startActivity(intent);
    }
}

编辑:我也为你的Foo活动,通过在清单中声明活动有一个领先的点。删除此以查找您的活动。在清单中声明您的活动的最佳方式是使用GUI(Android清单文件&gt;应用程序&gt;应用程序节点&gt;添加&gt;活动&gt;名称:选择您的活动

在Android中享受编码乐趣! Grtz

答案 4 :(得分:0)

你的Foo类应该是setContentView。 也就是说,

public class Foo extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Foo.setContentView(R.layout.????)
        //populateWithLatest();
    }
}

否则