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android 裁剪图片大小 控制图片尺寸
用BitmapFactory获取适合屏幕大小的图片 和自带的图片裁剪工具
package com.lin.image; 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.view.View; import android.widget.Button; import android.widget.ImageView; public class ImageScaleActivity extends Activity implements View.OnClickListener{ /** Called when the activity is first created. */ private Button selectImageBtn; private Button cutImageBtn; private ImageView imageView; private static final int IMAGE_SELECT=1; private static final int IMAGE_CUT=2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); selectImageBtn=(Button)findViewById(R.id.selectImageBtn); cutImageBtn=(Button)findViewById(R.id.catImageBtn); imageView=(ImageView)findViewById(R.id.imageView); cutImageBtn.setOnClickListener(this); selectImageBtn.setOnClickListener(this); } @Override public void onClick(View v) { <span style="white-space:pre"> </span>//截取适合屏幕大小的图片 if(v==selectImageBtn){ Intent intent=new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, IMAGE_SELECT); }//一般用于头像等需要设置指定大小 else if(v==cutImageBtn){ Intent intent=getImageClipIntent(); startActivityForResult(intent, IMAGE_CUT); } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent intent) { // TODO Auto-generated method stub if(resultCode==RESULT_OK){ if(requestCode==IMAGE_SELECT){ Uri imageFileUri =intent.getData(); int dw=getWindowManager().getDefaultDisplay().getWidth(); int dh=getWindowManager().getDefaultDisplay().getHeight()/2; //已屏幕宽 和一般的高作为图片显示的最大尺寸 try{ BitmapFactory.Options factory=new BitmapFactory.Options(); factory.inJustDecodeBounds=true; //当为true时 允许查询图片不为 图片像素分配内存 Bitmap bmp=BitmapFactory.decodeStream(getContentResolver() .openInputStream(imageFileUri),null,factory); int hRatio=(int)Math.ceil(factory.outHeight/(float)dh); //图片是高度的几倍 int wRatio=(int)Math.ceil(factory.outWidth/(float)dw); //图片是宽度的几倍 System.out.println("hRatio:"+hRatio+" wRatio:"+wRatio); //缩小到 1/ratio的尺寸和 1/ratio^2的像素 if(hRatio>1||wRatio>1){ if(hRatio>wRatio){ factory.inSampleSize=hRatio; } else factory.inSampleSize=wRatio; } factory.inJustDecodeBounds=false; bmp=BitmapFactory.decodeStream(getContentResolver() .openInputStream(imageFileUri),null,factory); imageView.setImageBitmap(bmp); }catch(Exception ex){ } } else if(requestCode==IMAGE_CUT){ Bitmap bmp=intent.getParcelableExtra("data"); imageView.setImageBitmap(bmp); } } } /** * 获取剪切后的图片 */ public static Intent getImageClipIntent() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null); intent.setType("image/*"); intent.putExtra("crop", "true"); intent.putExtra("aspectX", 1);//裁剪框比例 intent.putExtra("aspectY", 1); intent.putExtra("outputX", 80);//输出图片大小 intent.putExtra("outputY", 80); intent.putExtra("return-data", true); return intent; } }
摘自 dikeboy1234的专栏
android 裁剪图片大小 控制图片尺寸
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