这是我目前的代码:
public class MallMapActivity extends Activity {
private final static String tag = "MallMapActivity";
private ImageView iv;
private final static String FLOOR = "F";
private final String storagePath = Environment.getExternalStorageDirectory() + "/appdata23";
private final String localMapsPath = storagePath + "/localMaps";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
iv = (ImageView)findViewById(R.id.imageview);
//iv.setScaleType(ScaleType.FIT_XY);
final LinearLayout levelLayout = (LinearLayout) findViewById(R.id.level_layout);
int levelSize = 8;
for (int i = 0; i < levelSize; i++) {
Button levelButton = new Button(this.getApplicationContext());
if(i==0) {
levelButton.setText(new StringBuffer((i+1)+"").append(FLOOR).append("(start)"));
} else if (i==7) {
levelButton.setText(new StringBuffer((i+1)+"").append(FLOOR).append("(end)"));
} else {
levelButton.setText(new StringBuffer((i+1)+"").append(FLOOR));
}
levelButton.setTag((i+1) + FLOOR);
levelButton.setId(i);
levelButton.setLayoutParams(
new RadioGroup.LayoutParams(0, RadioGroup.LayoutParams.WRAP_CONTENT, 1));
levelButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
int childCount = levelLayout.getChildCount();
int viewId = view.getId();
for (int j = 0; j < childCount; j++) {
Button btn = (Button)levelLayout.getChildAt(j);
if(viewId == j)
btn.setTextColor(Color.BLUE);
else
btn.setTextColor(Color.BLACK);
}
//sample data
double currentPixelX = 169d;
double currentPixelY = 347d;
Log.i(tag, " currentPixelX:" + currentPixelX);
Log.i(tag, " currentPixelY:" + currentPixelY);
int circleSize = 20;
Paint currentPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
currentPaint.setColor(Color.GREEN);
currentPaint.setAlpha(75);
String path = new StringBuffer(localMapsPath)
.append("/").append(view.getTag()).append(".png").toString();
File file = new File(path);
InputStream stream = null;
try {
stream = new FileInputStream(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Bitmap mapBitmap = BitmapFactory.decodeStream(stream);
Canvas canvas = new Canvas(mapBitmap);
canvas.drawCircle(
Double.valueOf(currentPixelX).floatValue(),
Double.valueOf(currentPixelY).floatValue(),
circleSize, currentPaint);
iv.setImageBitmap(mapBitmap);
iv.invalidate();
}
});
levelLayout.addView(levelButton);
}
levelLayout.getChildAt(0).performClick();
}
}
以下是错误内容:
错误/ AndroidRuntime(8626):未捕获的处理程序:线程主要退出到期 未捕获的异常ERROR / AndroidRuntime(8626): java.lang.RuntimeException:无法启动活动 ComponentInfo {com.sample / com.sample.MallMapActivity}: java.lang.IllegalStateException:传递给Canvas的不可变位图 * 构造函数 * ERROR / AndroidRuntime(8626):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2503) 错误/ AndroidRuntime(8626):at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2519) 错误/ AndroidRuntime(8626):at android.app.ActivityThread.access $ 2200(ActivityThread.java:123) 错误/ AndroidRuntime(8626):at android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1870) 错误/ AndroidRuntime(8626):at android.os.Handler.dispatchMessage(Handler.java:99) 错误/ AndroidRuntime(8626):at android.os.Looper.loop(Looper.java:123)ERROR / AndroidRuntime(8626):
在android.app.ActivityThread.main(ActivityThread.java:4370) 错误/ AndroidRuntime(8626):at java.lang.reflect.Method.invokeNative(Native Method) 错误/ AndroidRuntime(8626):at java.lang.reflect.Method.invoke(Method.java:521) 错误/ AndroidRuntime(8626):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868) 错误/ AndroidRuntime(8626):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 错误/ AndroidRuntime(8626):at dalvik.system.NativeStart.main(本机方法) ERROR / AndroidRuntime(8626):引起: java.lang.IllegalStateException:传递给Canvas的不可变位图 * 构造函数 * ERROR / AndroidRuntime(8626):at android.graphics.Canvas。(Canvas.java:83) 错误/ AndroidRuntime(8626):at com.sample.MallMapActivity $ 1.onClick(MallMapActivity.java:110) 错误/ AndroidRuntime(8626):at android.view.View.performClick(View.java:2397) 错误/ AndroidRuntime(8626):at com.sample.MallMapActivity.onCreate(MallMapActivity.java:124) 错误/ AndroidRuntime(8626):at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 错误/ AndroidRuntime(8626):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2466) ERROR / AndroidRuntime(8626):... 11 more ERROR / SemcCheckin(8626): 获取崩溃转储级别:java.io.FileNotFoundException: / data / semc-checkin / crashdump ERROR / SemcCheckin(1544):获取崩溃等级 :java.io.FileNotFoundException:/ data / semc-checkin / crashdump
更新
Bitmap mapBitmap = BitmapFactory.decodeStream(stream); Bitmap newMapBitmap = mapBitmap.copy(Bitmap.Config.ARGB_8888,
TRUE); Canvas canvas = new Canvas(newMapBitmap);
答案 0 :(得分:2)
进行此更改:您无法在不可变位图上绘制,而是可以创建一个
Bitmap mapBitmap = BitmapFactory.decodeStream(stream);
//make a new mutable bitmap
Bitmap map = createBitmap(mapBitmap.getWidth(), mapBitmap.getHeight(),mapBitmap.getConfig());
//copy the pixel to it
int [] allpixels = new int [ mapBitmap.getHeight()*mapBitmap.getWidth()];
mapBitmap.getPixels(allpixels, 0, mapBitmap.getWidth(), 0, 0, mapBitmap.getWidth(),mapBitmap.getHeight());
map.setPixels(allpixels, 0, mapBitmap.getWidth(), 0, 0, mapBitmap.getWidth(), mapBitmap.getHeight());
Canvas canvas = new Canvas(map);
然后开始绘图