读取手机相册图片并显示代码,Java代码库,德仔网

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【Java】读取手机相册图片并显示

作者:wangchenfeng / 发布于2015/4/14/ 590


	package com.mediaapp;
	
	
	import java.io.FileNotFoundException;
	
	import android.app.Activity;
	import android.content.Intent;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.net.Uri;
	import android.os.Bundle;
	import android.util.DisplayMetrics;
	import android.util.Log;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.widget.Button;
	import android.widget.ImageView;
	
	public class MainActivity extends Activity {
	
	
	
	 ImageView imageView;
	 Button btn;
	
	
	 @Override
	 protected void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.activity_main);
	 imageView = (ImageView) findViewById(R.id.image1);
	 btn = (Button) findViewById(R.id.btn);
	 btn.setOnClickListener(clickListener);
	 }
	
	 OnClickListener clickListener = new OnClickListener() {
	
	 @Override
	 public void onClick(View view) {
	 Intent intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
	 startActivityForResult(intent, 0);
	 }
	 };
	
	
	
	
	 private void bitmapFactory(Uri uri){
	 BitmapFactory.Options options = new BitmapFactory.Options();
	 //options.inSampleSize = 8;//设置生成的图片为原图的八分之一
	 options.inJustDecodeBounds = true;//这将通知 BitmapFactory类只须返回该图像的范围,而无须尝试解码图像本身
	 DisplayMetrics dm = new DisplayMetrics();
	 getWindowManager().getDefaultDisplay().getMetrics(dm);
	 int width = dm.widthPixels;
	 int height = dm.heightPixels;
	 int heightRadio = (int) Math.ceil(options.outHeight/(float)height);
	 int widthRadio = (int) Math.ceil(options.outWidth/(float)width);
	 if (heightRadio>1&&widthRadio>1) {
	 if (heightRadio>widthRadio) {
	 options.inSampleSize = heightRadio;
	 }else {
	 options.inSampleSize = widthRadio;
	 }
	 }
	 //真正解码图片
	 options.inJustDecodeBounds = false;
	 Bitmap b;
	 try {
	 b = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri),null, options);
	 imageView.setImageBitmap(b);
	 } catch (FileNotFoundException e) {
	 e.printStackTrace();
	 }
	 }
	
	
	
	
	 @Override
	 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	 super.onActivityResult(requestCode, resultCode, data);
	 if (resultCode==RESULT_CANCELED) {
	 return;
	 }
	 Log.d("MainActivity", 0+"");
	 if (requestCode==0) {
	 Uri uri = data.getData();
	 bitmapFactory(uri);
	 }
	 }
	
	}

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