Android 裁剪圖片大小 控制圖片尺寸

Android 用BitmapFactory獲取適合屏幕大小的圖片 和自帶的圖片裁剪工具

1. package com.lin.image;
3. import android.app.Activity;
4. import android.content.Intent;
5. import android.graphics.Bitmap;
6. import android.graphics.BitmapFactory;
7. import android.net.Uri;
8. import android.os.Bundle;
9. import android.view.View;
10. import android.widget.Button;
11. import android.widget.ImageView;
13. public class ImageScaleActivity extends Activity implements View.OnClickListener{
14. /** Called when the activity is first created. */
15. private Button selectImageBtn;
16. private Button cutImageBtn;
17. private ImageView imageView;
18. private static final int IMAGE_SELECT=1;
19. private static final int IMAGE_CUT=2;
20. @Override
21. public void onCreate(Bundle savedInstanceState) {
22. super.onCreate(savedInstanceState);
23. setContentView(R.layout.main);
25. selectImageBtn=(Button)findViewById(R.id.selectImageBtn);
26. cutImageBtn=(Button)findViewById(R.id.catImageBtn);
27. imageView=(ImageView)findViewById(R.id.imageView);
29. cutImageBtn.setOnClickListener(this);
30. selectImageBtn.setOnClickListener(this);
32. }
34. @Override
35. public void onClick(View v) {

1. //截取適合屏幕大小的圖片
2. if(v==selectImageBtn){
3. Intent intent=new Intent(Intent.ACTION_PICK,
4. android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
5. startActivityForResult(intent, IMAGE_SELECT);
6. }//一般用於頭像等需要設置指定大小
7. else if(v==cutImageBtn){
8. Intent intent=getImageClipIntent();
9. startActivityForResult(intent, IMAGE_CUT);
10. }
11. }
13. @Override
14. protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
15. // TODO Auto-generated method stub
16. if(resultCode==RESULT_OK){
17. if(requestCode==IMAGE_SELECT){
18. Uri imageFileUri =intent.getData();
19. int dw=getWindowManager().getDefaultDisplay().getWidth();
20. int dh=getWindowManager().getDefaultDisplay().getHeight()/2;
21. //已屏幕寬 和一般的高作為圖片顯示的最大尺寸
22. try{
23. BitmapFactory.Options factory=new BitmapFactory.Options();
24. factory.inJustDecodeBounds=true; //當為true時 允許查詢圖片不為 圖片像素分配內存
25. Bitmap bmp=BitmapFactory.decodeStream(getContentResolver()
26. .openInputStream(imageFileUri),null,factory);
27. int hRatio=(int)Math.ceil(factory.outHeight/(float)dh); //圖片是高度的幾倍
28. int wRatio=(int)Math.ceil(factory.outWidth/(float)dw); //圖片是寬度的幾倍
29. System.out.println("hRatio:"+hRatio+" wRatio:"+wRatio);
30. //縮小到 1/ratio的尺寸和 1/ratio^2的像素
31. if(hRatio>1||wRatio>1){
32. if(hRatio>wRatio){
33. factory.inSampleSize=hRatio;
34. }
35. else
36. factory.inSampleSize=wRatio;
37. }
38. factory.inJustDecodeBounds=false;
39. bmp=BitmapFactory.decodeStream(getContentResolver()
40. .openInputStream(imageFileUri),null,factory);
41. imageView.setImageBitmap(bmp);
42. }catch(Exception ex){
44. }
45. }
46. else if(requestCode==IMAGE_CUT){
47. Bitmap bmp=intent.getParcelableExtra("data");
48. imageView.setImageBitmap(bmp);
49. }
50. }
52. }
53. /**
54. * 獲取剪切後的圖片
55. */
56. public static Intent getImageClipIntent() {
58. Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
59. intent.setType("image/*");
60. intent.putExtra("crop", "true");
61. intent.putExtra("aspectX", 1);//裁剪框比例
62. intent.putExtra("aspectY", 1);
63. intent.putExtra("outputX", 80);//輸出圖片大小
64. intent.putExtra("outputY", 80);
65. intent.putExtra("return-data", true);
66. return intent;
67. }
70. }