Question

我的onclick监听器不会运行我正在使用的按钮，它会返回错误，我的应用程序在我的虚拟设备上关闭。我在下面的类中创建了按钮，并在我的清单中列出了这些代码

02-15 06:44:07.246: E/AndroidRuntime(837): FATAL EXCEPTION: main
02-15 06:44:07.246: E/AndroidRuntime(837): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.kingstonrent.uniproject/com.kingstonrent.uniproject.rentcalculator}: java.lang.ClassNotFoundException: Didn't find class "com.kingstonrent.uniproject.rentcalculator" on path: DexPathList[[zip file "/data/app/com.kingstonrent.uniproject-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.kingstonrent.uniproject-2, /system/lib]]
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.os.Looper.loop(Looper.java:137)
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.app.ActivityThread.main(ActivityThread.java:5103)
02-15 06:44:07.246: E/AndroidRuntime(837):  at java.lang.reflect.Method.invokeNative(Native Method)
02-15 06:44:07.246: E/AndroidRuntime(837):  at java.lang.reflect.Method.invoke(Method.java:525)
02-15 06:44:07.246: E/AndroidRuntime(837):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
02-15 06:44:07.246: E/AndroidRuntime(837):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-15 06:44:07.246: E/AndroidRuntime(837):  at dalvik.system.NativeStart.main(Native Method)
02-15 06:44:07.246: E/AndroidRuntime(837): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.kingstonrent.uniproject.rentcalculator" on path: DexPathList[[zip file "/data/app/com.kingstonrent.uniproject-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.kingstonrent.uniproject-2, /system/lib]]
02-15 06:44:07.246: E/AndroidRuntime(837):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
02-15 06:44:07.246: E/AndroidRuntime(837):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-15 06:44:07.246: E/AndroidRuntime(837):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
02-15 06:44:07.246: E/AndroidRuntime(837):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
02-15 06:44:07.246: E/AndroidRuntime(837):  ... 11 more

清单

<activity
        android:name="com.kingstonrent.uniproject.rentcalculator"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.kingstonrent.uniproject.RENTCALCULATOR" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

menu.java

    public class menu extends Activity {

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

            Button sr1 = (Button) findViewById(R.id.search);
            Button tut2 = (Button) findViewById(R.id.Notesone);
            Button tut3 = (Button) findViewById(R.id.twittertwo);
            Button but4 = (Button) findViewById(R.id.button1);

            sr1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startActivity(new Intent ("com.kingstonrent.uniproject.BROWSER"));
            }
        }); 

        tut2.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startActivity(new Intent ("com.kingstonrent.uniproject.MAKENOTE"));
            }
        });

         tut3.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startActivity(new Intent ("com.kingstonrent.uniproject.TWEET"));
            }
        });

         but4.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startActivity(new Intent ("com.kingstonrent.uniproject.RENTCALCULATOR"));

            }
        });

    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
    }

    public boolean onCreateOptionsMenu(Menu menu){
        super.onCreateOptionsMenu(menu);
        MenuInflater awesome = getMenuInflater();
        awesome.inflate(R.menu.main, menu);
        return true;
    }

    public boolean onOptionsItemSelected(MenuItem item){
        switch(item.getItemId()){
        case R.id.menuone:
        startActivity(new Intent("com.kingstonrent.uniproject.MENUBUTTON"));
        return true;

    }

    return false;
}

}

Answer 1

在Android [活动]中转入另一个屏幕。

明确的意图

  startActivity(new Intent (menu.this,com.kingstonrent.uniproject.BROWSER.class));

其中明确提到哪个活动转移到。但是对于这种情况，您需要当前活动的上下文，您可以从中启动转移到的Transit和Class名称。

在你的情况下

您当前活动的背景是menu.this您现在所处的位置。请适当使用命名约定和标准，因为menu是类。您应该使用Menu代替menu。
转化费用为com.kingstonrent.uniproject.BROWSER.class，应在活动名称后附加.class文件时提及。

您还需要在Yout Manifest文件中提及您转移到的活动。

<application>
<activity
   android:name="com.kingstonrent.uniproject.BROWSER"/>
 <activity
    android:name="com.kingstonrent.uniproject.rentcalculator"
    android:label="@string/app_name" >
    <intent-filter>
        <action android:name="com.kingstonrent.uniproject.RENTCALCULATOR" />

        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>
</application>

Answer 2

调用意图类的方法

Intent instance = new Intent（this，Activity.class）;

startActivity（new Intent（“com.kingstonrent.uniproject.BROWSER”））;

替换为

startActivity（new Intent（menu.this，com.kingstonrent.uniproject.BROWSER.class））;

与其他声明的意图相同

按钮没有加载活动的任何建议？

2 个答案: