自定义控件类报错，求指点
如题，报错是这样的错误
08-12 13:03:52.588: E/AndroidRuntime(26278): at com.wujiecao.face_maker.HandWrite.(HandWrite.java:44)
请问是不是线程的问题？
相关代码
public void setbimap(byte[] bytrarry) {
originalBitmap = BitmapFactory.decodeByteArray(bytrarry, 0, bytrarry.length);
this.invalidate();
Canvas canvas = null;
onDraw(canvas);
}
public HandWrite(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
new1Bitmap = Bitmap.createBitmap(originalBitmap);
}
这个是一个自定义控件的类
new1Bitmap = Bitmap.createBitmap(originalBitmap);
你构造的时候originalBitmap这个变量有赋值吗？？
把Log和代码都贴全点出来吧
从你上面贴出的代码看你直接调用了ondraw，但传给ondraw的canvas是个null值，你确定这样写吗？而且从你现在的贴出来的东西根本没办法定位问题。。。。
package com.wujiecao.face_maker;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RadioGroup;
public class Second extends ActionBarActivity {
private ImageView imageView;
private Button next;
private RadioGroup pic;
// 下面是自己试写的
private int width, height;
private HandWrite handWrite = null;
private Button clear;
private int whichColor = 0, whichStrokeWidth = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
// imageView = (ImageView) findViewById(R.id.imageView1);
Intent intent = getIntent();
Bundle extras = getIntent().getExtras();
byte[] byteArray = extras.getByteArray("IMG");
handWrite.setbimap(byteArray);
Log.e("TAG", byteArray + "");
setContentView(R.layout.activity_second);
/*
* Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0,
* byteArray.length);
*/
// imageView.setImageBitmap(bitmap);
}
// 保存
public void saveBitmap(File file, Bitmap mBitmap) throws IOException {
try {
file.createNewFile();
FileOutputStream fileOut = null;
fileOut = new FileOutputStream(file);
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOut);
fileOut.flush();
fileOut.close();
} catch (FileNotFoundException e) {
// TODO: handle exception
e.printStackTrace();
} catch (IOException e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
package com.wujiecao.face_maker;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.util.Base64;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class HandWrite extends View {
Paint paint = null;
private Bitmap originalBitmap = null;
Bitmap new1Bitmap = null;
private Bitmap new2Bitmap = null;
Bitmap m_originalBitmap;
private float clickX = 0, clickY = 0;
private float startX = 0, startY = 0;
private boolean isMove = true;
private boolean isClear = false;
int color = Color.WHITE;
float stroeWidth = 3.0f;
public Bitmap setbimap(byte[] bytrarry) {
Log.e("TAG1", bytrarry + "");
Bitmap mBitmap = null;
InputStream inputStream = null;
try {
bytrarry = Base64.decode(bytrarry, Base64.DEFAULT);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
inputStream = new ByteArrayInputStream(bytrarry);
SoftReference softReference = new SoftReference(BitmapFactory.decodeStream(inputStream, null, options));
mBitmap = (Bitmap) softReference.get();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
} finally {
if (bytrarry != null) {
bytrarry = null;
}
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e2) {
// TODO: handle exception
e2.printStackTrace();
}
}
}
// YuvImage yuvImage = new YuvImage(bytrarry, ImageFormat.NV21, 20, 20,
// null);
// ByteArrayOutputStream baos = new ByteArrayOutputStream();
// yuvImage.compressToJpeg(new Rect(0, 0, 20, 20), 80, baos);
// byte[] jdata = baos.toByteArray();
// originalBitmap = BitmapFactory.decodeByteArray(jdata, 0,
// jdata.length);
// /*
// * this.invalidate(); Canvas canvas = null; onDraw(canvas);
// */
originalBitmap = mBitmap;
return mBitmap;
}
public HandWrite(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
// originalBitmap = BitmapFactory.decodeResource(getResources(),
// R.drawable.ic_launcher)
// .copy(Bitmap.Config.ARGB_8888, true);
originalBitmap = setbimap(null);
Log.e("TAG", originalBitmap + "");
new1Bitmap = Bitmap.createBitmap(originalBitmap);
}
public void clear() {
isClear = true;
new2Bitmap = Bitmap.createBitmap(originalBitmap);
invalidate();
}
public void setstyle(float strokeWidth) {
this.stroeWidth = strokeWidth;
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
canvas.drawBitmap(HandWriting(new1Bitmap), 0, 0, null);
}
//
//
public Bitmap HandWriting(Bitmap originalBitmap) {
Canvas canvas = null;
if (isClear) {
canvas = new Canvas(new2Bitmap);
} else {
canvas = new Canvas(originalBitmap);
}
paint = new Paint();
paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
paint.setColor(color);
paint.setStrokeWidth(stroeWidth);
if (isMove) {
canvas.drawLine(startX, startY, clickX, clickY, paint);
}
startX = clickX;
startY = clickY;
if (isClear) {
return new2Bitmap;
}
return originalBitmap;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
clickX = event.getX();
clickY = event.getY();
if (event.getAction() == MotionEvent.ACTION_DOWN) {
isMove = false;
invalidate();
return true;
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
isMove = true;
invalidate();
return true;
}
return super.onTouchEvent(event);
}
}
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="com.wujiecao.face_maker.Second" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/button2"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:src="@drawable/ic_launcher" />
<Button
android:id="@+id/next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/imageView1"
android:layout_alignParentBottom="true"
android:text="next" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/next"
android:layout_alignRight="@+id/imageView1" />
<RadioGroup
android:id="@+id/radioGroup1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/next"
android:layout_alignParentRight="true"
android:orientation="horizontal" >
<RadioButton
android:id="@+id/radio0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/item"
android:checked="true" />
<RadioButton
android:id="@+id/radio1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2" />
<RadioButton
android:id="@+id/radio2"
android:layout_width="282dp"
android:layout_height="wrap_content"
android:text="3" />
</RadioGroup>
<com.wujiecao.face_maker.HandWrite
android:id="@+id/handwriteview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentRight="true" />