怎样在一个activity里启动另一个包里的activity ?

Question

看看这个：
http://blog.csdn.net/lincyang/archive/2010/09/09/5872632.aspx

Answer 1

在AndroidManifest.xml里怎样注册另一包里的activity
在    </application>前加
<activity android:name="app.mtask.MailTask"> </activity>

Answer 2

出现错误
Installation error: INSTALL_PARSE_FAILED_MANIFEST_MALFORMED

Answer 3

Intent intent = new Intent(firstActivity.this, secondActivity.class);
this.startActivity(intent);AndroidManifest.xml
        <activity android:name=".firstActivity"
                  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="com.test2.secondActivity"
                  android:label="@string/app_name">
        </activity>

Answer 4

ComponentName componentName=new   ComponentName("com.blessdyb.android","com.blessdyb.android.Painter");   
                Intent intent=new Intent();   
                intent.setComponent(componentName);   
                intent.setAction(Intent.ACTION_VIEW);   
                startActivity(intent);   
其中
包名："com.blessdyb.android",
Activity名:"com.blessdyb.android.Painter"