InflateException in custom ImageView

Question

I'm making an example that rotate an image like this post.
I've extends ImageView then override the OnDraw and put in MainActivity. But It fired "InflateException". Here is my example code:
MImageView

public class MImageView extends ImageView {

    public MImageView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        canvas.save();
        canvas.rotate(45, 0, 0);
        super.onDraw(canvas);
        canvas.restore();
    }
}

MainActivity

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        MImageView mImageView = (MImageView) findViewById(R.id.imageView1);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

main_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >



    <com.example.rotatetest.MImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.rotatetest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.rotatetest.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Logcat

08-16 10:21:31.820: D/AndroidRuntime(5135): Shutting down VM
08-16 10:21:31.820: W/dalvikvm(5135): threadid=1: thread exiting with uncaught exception (group=0x40ab4210)
08-16 10:21:31.820: E/AndroidRuntime(5135): FATAL EXCEPTION: main
08-16 10:21:31.820: E/AndroidRuntime(5135): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rotatetest/com.example.rotatetest.MainActivity}: android.view.InflateException: Binary XML file line #13: Error inflating class com.example.rotatetest.MImageView
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2049)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2083)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.ActivityThread.access$600(ActivityThread.java:134)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1233)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.os.Looper.loop(Looper.java:137)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.ActivityThread.main(ActivityThread.java:4697)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at java.lang.reflect.Method.invokeNative(Native Method)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at java.lang.reflect.Method.invoke(Method.java:511)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at dalvik.system.NativeStart.main(Native Method)
08-16 10:21:31.820: E/AndroidRuntime(5135): Caused by: android.view.InflateException: Binary XML file line #13: Error inflating class com.example.rotatetest.MImageView
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.view.LayoutInflater.createView(LayoutInflater.java:589)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:255)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.Activity.setContentView(Activity.java:1879)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at com.example.rotatetest.MainActivity.onCreate(MainActivity.java:15)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.Activity.performCreate(Activity.java:4539)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2013)
08-16 10:21:31.820: E/AndroidRuntime(5135):     ... 11 more
08-16 10:21:31.820: E/AndroidRuntime(5135): Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
08-16 10:21:31.820: E/AndroidRuntime(5135):     at java.lang.Class.getConstructorOrMethod(Class.java:460)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at java.lang.Class.getConstructor(Class.java:431)
08-16 10:21:31.820: E/AndroidRuntime(5135):     at android.view.LayoutInflater.createView(LayoutInflater.java:561)
08-16 10:21:31.820: E/AndroidRuntime(5135):     ... 22 more

Did I do something wrong?

Answer 1

You're missing the constructor for MImageView(Context, Attributeset). Just add it and the error will be gone :)

Answer 2

You have not implemented constructor with (class android.content.Context, interface android.util.AttributeSet) signature.