我试图截图我的ip cam的直播。我能够做到并将其保存到我的SD卡，问题是我点击屏幕截图按钮即可获得（＆＃34;很遗憾，您的应用已经停止＆＃34;）。这是我的代码......
package com.example.isec.isec;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.os.Bundle;
import android.os.Environment;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MjpegView extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "MjpegView";
public final static int POSITION_UPPER_LEFT = 9;
public final static int POSITION_UPPER_RIGHT = 3;
public final static int POSITION_LOWER_LEFT = 12;
public final static int POSITION_LOWER_RIGHT = 6;
public final static int SIZE_STANDARD = 1;
public final static int SIZE_BEST_FIT = 4;
public final static int SIZE_FULLSCREEN = 8;
//private MjpegViewfunc clickFunc;
private MjpegViewThread thread;
private MjpegInputStream mIn = null;
private boolean showFps = false;
private boolean mRun = false;
private boolean surfaceDone = false;
private Paint overlayPaint;
private int overlayTextColor;
private int overlayBackgroundColor;
private int ovlPos;
private int dispWidth;
private int dispHeight;
private int displayMode;
public void clickFunc(View view) {
if (view.getId() == R.id.button9) ;
// Toast.makeText(MjpegViewfunc.this, "Button Clicked", Toast.LENGTH_SHORT).show();
try {
//Bitmap bitmap = takeScreenShot();
MjpegView.this.thread.run();
// Bitmap bitmap = takeScreenShot(activity, ResourceID);
// saveBitmap(bitmap);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return;
}
public class MjpegViewThread extends Thread {
private SurfaceHolder mSurfaceHolder;
private int frameCounter = 0;
private long start;
private Bitmap ovl;
public MjpegViewThread(SurfaceHolder surfaceHolder, Context context) {
mSurfaceHolder = surfaceHolder;
}
private Rect destRect(int bmw, int bmh) {
int tempx;
int tempy;
if (displayMode == MjpegView.SIZE_STANDARD) {
tempx = (dispWidth / 2) - (bmw / 2);
tempy = (dispHeight / 2) - (bmh / 2);
return new Rect(tempx, tempy, bmw + tempx, bmh + tempy);
}
if (displayMode == MjpegView.SIZE_BEST_FIT) {
float bmasp = (float) bmw / (float) bmh;
bmw = dispWidth;
bmh = (int) (dispWidth / bmasp);
if (bmh > dispHeight) {
bmh = dispHeight;
bmw = (int) (dispHeight * bmasp);
}
tempx = (dispWidth / 2) - (bmw / 2);
tempy = (dispHeight / 2) - (bmh / 2);
return new Rect(tempx, tempy, bmw + tempx, bmh + tempy);
}
if (displayMode == MjpegView.SIZE_FULLSCREEN) {
return new Rect(0, 0, dispWidth, dispHeight);
}
return null;
}
public void setSurfaceSize(int width, int height) {
synchronized (mSurfaceHolder) {
dispWidth = width;
dispHeight = height;
}
}
public Bitmap makeFpsOverlay(Paint p, String text) {
Rect b = new Rect();
p.getTextBounds(text, 0, text.length(), b);
int bwidth = b.width() + 2;
int bheight = b.height() + 2;
Bitmap bm = Bitmap.createBitmap(bwidth, bheight, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bm);
p.setColor(overlayBackgroundColor);
c.drawRect(0, 0, bwidth, bheight, p);
p.setColor(overlayTextColor);
c.drawText(text, -b.left + 1, (bheight / 2) - ((p.ascent() + p.descent()) / 2) + 1, p);
return bm;
}
public void run() {
start = System.currentTimeMillis();
PorterDuffXfermode mode = new PorterDuffXfermode(PorterDuff.Mode.DST_OVER);
Bitmap bm;
int width;
int height;
Rect destRect;
Canvas c = null;
Paint p = new Paint();
String fps;
while (mRun) {
if (surfaceDone) {
try {
c = mSurfaceHolder.lockCanvas();
synchronized (mSurfaceHolder) {
try {
bm = mIn.readMjpegFrame();
destRect = destRect(bm.getWidth(), bm.getHeight());
c.drawColor(Color.BLACK);
c.drawBitmap(bm, null, destRect, p);
if (showFps) {
p.setXfermode(mode);
if (ovl != null) {
height = ((ovlPos & 1) == 1) ? destRect.top : destRect.bottom - ovl.getHeight();
width = ((ovlPos & 8) == 8) ? destRect.left : destRect.right - ovl.getWidth();
c.drawBitmap(ovl, width, height, null);
}
//return bm;
p.setXfermode(null);
frameCounter++;
if ((System.currentTimeMillis() - start) >= 1000) {
fps = String.valueOf(frameCounter) + " fps";
frameCounter = 0;
start = System.currentTimeMillis();
ovl = makeFpsOverlay(overlayPaint, fps);
}
Random r = new Random();
int iterator = r.nextInt();
String mPath = Environment.getExternalStorageDirectory().toString() + "/screenshots/";
File imageFile = new File(mPath);
imageFile.mkdirs();
imageFile = new File(imageFile + "/" + iterator + "_screenshot.png");
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, bos);
byte[] bitmapdata = bos.toByteArray();
FileOutputStream fos = new FileOutputStream(imageFile);
fos.write(bitmapdata);
fos.flush();
fos.close();
return;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return;
}
} catch (IOException e) {
e.getStackTrace();
Log.d(TAG, "catch IOException hit in run", e);
}
}
} finally {
if (c != null) {
mSurfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
// return;
}
}
private void init(Context context) {
SurfaceHolder holder = getHolder();
holder.addCallback(this);
thread = new MjpegViewThread(holder, context);
setFocusable(true);
overlayPaint = new Paint();
overlayPaint.setTextAlign(Paint.Align.LEFT);
overlayPaint.setTextSize(12);
overlayPaint.setTypeface(Typeface.DEFAULT);
overlayTextColor = Color.WHITE;
overlayBackgroundColor = Color.BLACK;
ovlPos = MjpegView.POSITION_LOWER_RIGHT;
displayMode = MjpegView.SIZE_STANDARD;
dispWidth = getWidth();
dispHeight = getHeight();
}
public void startPlayback() {
if (mIn != null) {
mRun = true;
thread.start();
}
}
public void stopPlayback() {
mRun = false;
boolean retry = true;
while (retry) {
try {
thread.join();
retry = false;
} catch (InterruptedException e) {
e.getStackTrace();
Log.d(TAG, "catch IOException hit in stopPlayback", e);
}
}
}
public MjpegView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public void surfaceChanged(SurfaceHolder holder, int f, int w, int h) {
thread.setSurfaceSize(w, h);
}
public void surfaceDestroyed(SurfaceHolder holder) {
surfaceDone = false;
stopPlayback();
}
public MjpegView(Context context) {
super(context);
init(context);
}
public void surfaceCreated(SurfaceHolder holder) {
surfaceDone = true;
}
public void showFps(boolean b) {
showFps = b;
}
public void setSource(MjpegInputStream source) {
mIn = source;
startPlayback();
}
public void setOverlayPaint(Paint p) {
overlayPaint = p;
}
public void setOverlayTextColor(int c) {
overlayTextColor = c;
}
public void setOverlayBackgroundColor(int c) {
overlayBackgroundColor = c;
}
public void setOverlayPosition(int p) {
ovlPos = p;
}
public void setDisplayMode(int s) {
displayMode = s;
}
}
和我的错误......
at android.view.View.performClick(View.java:4424)
at android.view.View$PerformClick.run(View.java:18383)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4998)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
at dalvik.system.NativeStart.main(Native Method)
09-09 11:18:47.227 10479-10900/com.example.isec.isec D/dalvikvm﹕ GC_FOR_ALLOC freed 4036K, 22% free 21589K/27336K, paused 79ms, total 82ms
09-09 11:18:47.237 10479-10900/com.example.isec.isec W/System.err﹕ java.io.FileNotFoundException: /storage/sdcard/screenshots/-1867569916_screenshot.png: open failed: EACCES (Permission denied)
09-09 11:18:47.237 10479-10900/com.example.isec.isec W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:409)
09-09 11:18:47.237 10479-10900/com.example.isec.isec W/System.err﹕ at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
09-09 11:18:47.237 10479-10900/com.example.isec.isec W/System.err﹕ at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
09-09 11:18:47.247 10479-10900/com.example.isec.isec W/System.err﹕ at com.examp
答案 0 :(得分：1)
您需要在Android Manifest中包含以下行
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>