android.view.InflateException：XML 布局中的二进制 XML 文件行答案

【问题标题】：android.view.InflateException: Binary XML file line in XML Layoutandroid.view.InflateException：XML 布局中的二进制 XML 文件行
【发布时间】：2014-02-26 11:05:39
【问题描述】：

这是我的代码。当我膨胀显示异常的视图时，名为 android.view.InflateException : Binary XML line #8 in my MainActivity 类。还会使应用程序崩溃，如果代码有任何错误？请帮助我

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="@drawable/ic_launcher">

    <com.example.newscratch.PaintView
        android:layout_gravity="center"
        android:id="@+id/img1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

PaintView.java

package com.example.newscratch;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class PaintView extends View implements OnTouchListener {
private static final String TAG = "PaintView";
Bitmap Bitmap1, Bitmap2;
Bitmap Transparent;
Bitmap overlay;
int X = -100;
int Y = -100;
Canvas c2;
private boolean isTouched = false;

// List<Point> points = new ArrayList<Point>();
Paint paint = new Paint();

public PaintView(Activity context) {
    super(context);
    initView(context);
}

 private void initView(Activity context) {
     setFocusable(true);
        setFocusableInTouchMode(true);
        this.setOnTouchListener(this);
        DisplayMetrics metrics = context.getResources().getDisplayMetrics();
        int width = metrics.widthPixels;
        int height = metrics.heightPixels;

        Transparent = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.main);
        Bitmap2 = BitmapFactory
                .decodeResource(getResources(), R.drawable.ic_launcher);

        c2 = new Canvas();
        c2.setBitmap(Transparent);
          //        c2.drawBitmap(Bitmap1, 0, 0, null);
        c2.drawBitmap(Bitmap2, 0, 0, paint);

        paint.setAlpha(0);
        paint.setStyle(Style.FILL);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT));
        paint.setAntiAlias(true);   
}

private static Point getDisplaySize(final Display display) {
  final Point point = new Point();
   point.x = display.getWidth();
   point.y = display.getHeight();
  return point;
 }

@Override
public void onDraw(Canvas canvas) {
    System.out.println("onDraw");
    c2.drawCircle(X, Y, 50, paint);
    if(isTouched)
    {
        canvas.drawBitmap(Bitmap1, 0, 0, null);
    }
    canvas.drawBitmap(Transparent, 0, 0, null);

}

public boolean onTouch(View view, MotionEvent event) {
    isTouched = true;
    X = (int) event.getX();
    Y = (int) event.getY();

    invalidate();
    return true;
}
 }

  class Point {
float x, y;

@Override
public String toString() {
    return x + ", " + y;
}
 }

MainActivity.java

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
//        View bgView = findViewById(R.id.background);
    }
}

【问题讨论】：

请发布异常堆栈跟踪，包括嵌套的“由”异常。
您是否为您正在尝试开发的内容添加了适当的库，如果是，请尝试清理您的项目或重新启动 Eclipse。或者如果不是，则正确检查两次并添加它。

标签： android android-xml android-custom-view

【解决方案1】：

您必须在 PaintView 类中再定义两个构造函数...

    public PaintView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initView(context);
    }

    public PaintView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView(context);
    }

【讨论】：

【解决方案2】：

没有堆栈跟踪，这并不容易......

乍一看：您的 PaintView 类中缺少适当的构造函数。

使用此签名添加构造函数：

public PaintView(Context context, AttributeSet attrs, int defStyle){
     super(...);
     ...
}

【讨论】：

【解决方案3】：

我想你忘了实现“XML 构造函数”。您应该添加：

public PaintView((Context context, AttributeSet attrs) {
    super(context, attrs);
    initView(context);
}

请参阅documentation 了解更多信息。

【讨论】：