我写的瀑布流显示图片
每次执行到Log.e("error","101成功压缩图片")这句就没办法执行了，下面是我的代码
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ScrollView;
public class MainActivity extends Activity implements Runnable{
private final int NUM_OF_PIC = 30; //每次请求获取的图片数量
private LinearLayout linearLayout1 = null;
private LinearLayout linearLayout2 = null;
private LinearLayout linearLayout3 = null;
private View scrollView = null;
public static int USE_LINEAR_INTERVAL = 0;
public static int linearlayoutWidth;
private byte[][] picBytes = new byte[NUM_OF_PIC][];
private int numOfPic = 0;//已加载的图片数量
private int index = 0;
public static int requestTime = 0;
private PictureArrayOfBytes picArray ;
private Handler mHandler = new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
try {
Log.e("error","39");
addBitmaps();
Log.e("error","41");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
linearLayout1 = (LinearLayout)findViewById(R.id.main_linearlayout1);
linearLayout2 = (LinearLayout)findViewById(R.id.main_linearlayout2);
linearLayout3 = (LinearLayout)findViewById(R.id.main_linearlayout3);
linearlayoutWidth = (int)(getWindowManager().getDefaultDisplay().getWidth()/3);
Log.e("error","creat: " + String.valueOf(linearlayoutWidth));
scrollView = findViewById(R.id.scroll);
Log.e("error","61");
final Thread thread = new Thread(new MainActivity());
Log.e("error","65");
thread.start();
Log.e("error","67");
Log.e("info", "context: "+(context == null));
scrollView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN :
break;
case MotionEvent.ACTION_MOVE :
index++;
break;
default :
break;
}
if (event.getAction() == MotionEvent.ACTION_UP && index > 0) {
index = 0;
View view = ((ScrollView) v).getChildAt(0);
if (view.getMeasuredHeight() <= v.getScrollY() + v.getHeight()) {
//加载数据代码
//每次加载30张图片，一共加载5次
if (numOfPic >= NUM_OF_PIC){
numOfPic = 0;
thread.start();
}
}
}
return false;
}
});
Log.e("error","90");
}
private void addBitmaps() throws Exception{
Log.e("error","87:开始加载图片");
for (int i = 0; i < NUM_OF_PIC; i++){
Log.e("error","将图片数据转换成bitmap");
Bitmap bitmap = BitmapFactory.decodeByteArray(picBytes[i], 0, picBytes[i].length);
Log.e("error","改编图片的大小");
Bitmap bitmap2 = BitmapZoom.bitmapZoomByWidth(bitmap, 240); //压缩图片大小
Log.e("error","101成功压缩图片");
Log.e("info", "context: "+(context == null));
ImageView imageView = new ImageView(this);
Log.e("error","103");
imageView.setImageBitmap(bitmap);
Log.e("error","105");
//根据图片的大小，为图片挖坑
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(bitmap2.getWidth(), bitmap2.getHeight());
//将坑和图片对象联系起来
Log.e("error","109");
imageView.setLayoutParams(layoutParams);
Log.e("error","111");
//按照顺序加载图片
switch (USE_LINEAR_INTERVAL)
{
case 0:
linearLayout1.addView(imageView);
numOfPic++;
break;
case 1:
linearLayout2.addView(imageView);
numOfPic++;
break;
case 2:
linearLayout3.addView(imageView);
numOfPic++;
break;
default:
break;
}
USE_LINEAR_INTERVAL++;
USE_LINEAR_INTERVAL= USE_LINEAR_INTERVAL%3;
}
}
@Override
public void run() {
// TODO Auto-generated method stub
try {
requestTime++;
picArray = new PictureArrayOfBytes(requestTime);
picBytes = picArray.getPicByteArray();
Message message = new Message();
message.what = 1;
Log.e("error","153");
mHandler.sendMessage(message);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
下面是我的logcat中的信息:
06-07 15:08:39.146: D/dalvikvm(2418): GC_CONCURRENT freed 292K, 4% free 13039K/13511K, paused 6ms+6ms
06-07 15:08:46.238: E/error(2418): 153
06-07 15:08:46.238: E/error(2418): 39
06-07 15:08:46.238: E/error(2418): 87:开始加载图片
06-07 15:08:46.238: E/error(2418): 将图片数据转换成bitmap
06-07 15:08:46.315: D/dalvikvm(2418): GC_FOR_ALLOC freed 252K, 4% free 13084K/13575K, paused 76ms
06-07 15:08:46.315: I/dalvikvm-heap(2418): Grow heap (frag case) to 12.987MB for 160016-byte allocation
06-07 15:08:46.498: D/dalvikvm(2418): GC_FOR_ALLOC freed
06-07 15:08:46.498: E/error(2418): 改编图片的大小
06-07 15:08:46.566: D/dalvikvm(2418): GC_FOR_ALLOC freed 27K, 5% free 13214K/13767K, paused 66ms
06-07 15:08:46.575: I/dalvikvm-heap(2418): Grow heap (frag case) to 13.181MB for 230416-byte allocation
06-07 15:08:46.635: D/dalvikvm(2418): GC_FOR_ALLOC freed 0K, 5% free 13439K/14023K, paused 60ms
**06-07 15:08:46.645: E/error(2418): 101成功压缩图片
06-07 15:08:46.655: W/System.err(2418): java.lang.NullPointerException**
06-07 15:08:46.685: W/System.err(2418):at android.content.ContextWrapper.getResources(ContextWrapper.java:81)
06-07 15:08:46.685: W/System.err(2418): at android.view.View.(View.java:2696)
06-07 15:08:46.685: W/System.err(2418): at android.widget.ImageView.(ImageView.java:104)
06-07 15:08:46.685: W/System.err(2418): at com.example.mywaterfallversion2.MainActivity.addBitmaps(MainActivity.java:113)
06-07 15:08:46.685: W/System.err(2418): at com.example.mywaterfallversion2.MainActivity.access$0(MainActivity.java:101)
06-07 15:08:46.698: W/System.err(2418): at com.example.mywaterfallversion2.MainActivity$1.handleMessage(MainActivity.java:39)
06-07 15:08:46.698: W/System.err(2418): at android.os.Handler.dispatchMessage(Handler.java:99)
06-07 15:08:46.698: W/System.err(2418): at android.os.Looper.loop(Looper.java:137)
06-07 15:08:46.698: W/System.err(2418): at android.app.ActivityThread.main(ActivityThread.java:4424)
06-07 15:08:46.698: W/System.err(2418): at java.lang.reflect.Method.invokeNative(Native Method)
06-07 15:08:46.706: W/System.err(2418): at java.lang.reflect.Method.invoke(Method.java:511)
06-07 15:08:46.706: W/System.err(2418): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-07 15:08:46.706: W/System.err(2418): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-07 15:08:46.706: W/System.err(2418): at dalvik.system.NativeStart.main(Native Method)
