我想绘制一个图像，但每次运行我的应用程序时，它都会崩溃。它说，＆＃34;不幸的是，App Version1已停止。＆＃34;
我有一个Missile.java类，一个Board.java类，它是活动，以及layout_board，我将Missle.java与布局结合起来。
Board.java：（导入所有内容）
public class Board extends AppCompatActivity {
int coinsCounter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.board_layout);
setCoinsCounter(0);
// setContentView(new MyView(this,null));
}
}
Missile.java：
public class Missile extends ImageView {
Paint p;
public Missile(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
p = new Paint();
Bitmap b = BitmapFactory.decodeResource(getResources(), R.drawable.missile_cartoon);
p.setColor(Color.RED);
canvas.drawBitmap(b, 0, 0, null);
}
}
board_layout.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<com.myfirstapplication.owner.appversion1.Missile
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/missile"/>
// Un-relevant things (TextViews, ImageViews, etc):
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/coinsCounter"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/pauseButton"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:src="@drawable/pause_pic"
android:adjustViewBounds="true"
android:maxHeight="50dp"
android:maxWidth="100dp"
android:scaleType="fitXY"
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/coinPic"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="false"
android:src="@drawable/coin_cartoon"
android:adjustViewBounds="true"
android:maxHeight="20dp"
android:maxWidth="45dp"
android:scaleType="fitXY"
android:layout_toRightOf="@id/coinsCounter"
android:layout_alignParentStart="false"
android:layout_marginLeft="5dp"
android:layout_marginTop="2dp" />
</RelativeLayout>
日志：
06-16 18:29:07.931 3311-3311/com.myfirstapplication.owner.appversion1 D/AndroidRuntime: Shutting down VM
06-16 18:29:07.942 3311-3311/com.myfirstapplication.owner.appversion1 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.myfirstapplication.owner.appversion1, PID: 3311
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myfirstapplication.owner.appversion1/com.myfirstapplication.owner.appversion1.Board}: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class com.myfirstapplication.owner.appversion1.Missile
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class com.myfirstapplication.owner.appversion1.Missile
at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:280)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.myfirstapplication.owner.appversion1.Board.onCreate(Board.java:18)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class com.myfirstapplication.owner.appversion1.Missile
at android.view.LayoutInflater.createView(LayoutInflater.java:628)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:764)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:280)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.myfirstapplication.owner.appversion1.Board.onCreate(Board.java:18)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
at java.lang.Class.getConstructor(Class.java:528)
at java.lang.Class.getConstructor(Class.java:492)
at android.view.LayoutInflater.createView(LayoutInflater.java:592)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:764)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:280)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.myfirstapplication.owner.appversion1.Board.onCreate(Board.java:18)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
答案 0 :(得分：0)
它在这里说
Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
你的Missile类需要有一个与给定签名匹配的构造函数
public class Missile extends ImageView {
// ...
public Missile(Context context, AttributeSet attrs) {
super(context, attrs);
}
我个人推荐以下模式
public class Missile
extends ImageView {
public Missile(Context context) {
super(context);
init(context);
}
public Missile(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public Missile(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
@TargetApi(21)
public Missile(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(context);
}
// ...