Android的Bitmap和BitmapDrawable类解析-android学习之旅（六十）

使用简单图片

使用Drawable对象

bitmap和BitmapDrawable对象

package peng.liu.test;

import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ClipDrawable;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

import java.io.InputStream;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends Activity{
String[] images;
ImageView image;
int currentImg;
AssetManager asset;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
image = (ImageView) findViewById(R.id.imageBit);
try{
asset = getAssets();
images = asset.list("");
}catch (Exception e){
e.printStackTrace();
}
findViewById(R.id.btnBit).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (currentImg >= images.length){
currentImg = 0;
}
while (!images[currentImg].endsWith(".png")&&!images[currentImg].endsWith(".jpg")&&!images[currentImg].endsWith(".gif")){
currentImg++;
if (currentImg >= images.length){
currentImg = 0;
}
InputStream assetFile = null;
try{
assetFile = asset.open(images[currentImg++]);
}catch (Exception e){
e.printStackTrace();
}
BitmapDrawable drawable = (BitmapDrawable) image.getDrawable();
if (drawable != null && !drawable.getBitmap().isRecycled()){
drawable.getBitmap().recycle();
}
image.setImageBitmap(BitmapFactory.decodeStream(assetFile));
}
}
});
}
}