我看了别人的播客和自己写的demo发现一个问题，那就是图片裁剪的时候，如果你输入的裁剪分辨率较高的话，那么你就不能用bitmap方式来保存，这是谷歌那边定义的，因为图片太大就是把app的内存占满了。所以最好是你传入的是uri，直接在裁剪的时候设置output到指定的uri中，然后再onActivityResult哪里去设置图片。但是如果你的分辨率设置的很高的话又想在onActivityResult哪里拿到bitmap的话就会卡主在裁剪界面。所以最好是完全对uri进行操作比较好。此外相机拍摄的图片，在OnActivityResult哪里的data是空的。
package com.example.go2zoompic;import java.io.File;
import java.io.IOException;import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;public class MainActivity extends Activity {private ImageView imageView;private File afterZoomFile;private File picFile;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);imageView = (ImageView) findViewById(R.id.iv);imageView.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {new ZoomPic(MainActivity.this, imageView);}});}public void go2AlbumAndZoom(View view) {goImageAlbum();}public void go2CameraAndZoom(View view) {goCamera();}private void goCamera() {Intent captrueIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE, null);picFile = getUri();if (picFile == null) {return;}captrueIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(picFile));startActivityForResult(captrueIntent, 3);}private File getUri() {File dcimFile = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);if (!dcimFile.exists()) {Toast.makeText(MainActivity.this, "使用相机前请插入sd卡！",Toast.LENGTH_SHORT).show();return null;}File file = new File(dcimFile.getAbsolutePath() + "/dcim"+ System.currentTimeMillis() + ".jpg");if (!file.exists()) {try {file.createNewFile();} catch (IOException e) {e.printStackTrace();}}return file;}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);Uri uri = null;if (resultCode == RESULT_OK) {if (requestCode == 1) {if (data != null) {uri = data.getData();goZoomImage(uri, 1000, 1000);} else {Toast.makeText(MainActivity.this, "请选择图片",Toast.LENGTH_SHORT).show();}}if (requestCode == 2) {if (data == null) {Toast.makeText(MainActivity.this, "图片不存在了，亲",Toast.LENGTH_SHORT).show();return;}imageView.setImageURI(Uri.fromFile(afterZoomFile));}if (requestCode == 3) {
// 从相机拍摄的图片，返回的data是空的goZoomImage(Uri.fromFile(picFile), 1000, 1000);}}}/*** 跳转到图片裁剪* * @param uri*/public void goZoomImage(Uri uri, int width, int height) {try {Intent intent = new Intent("com.android.camera.action.CROP");intent.setDataAndType(uri, "image/*");intent.putExtra("crop", "true");intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(afterZoomFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getAbsolutePath()+ "/dcim" + System.currentTimeMillis() + ".jpg")));// 设置裁剪后的分辨率intent.putExtra("outputX", width);intent.putExtra("outputY", height);// aspectX aspectY 是宽高的比例intent.putExtra("aspectX", width);intent.putExtra("aspectY", height);intent.putExtra("return-data", true);startActivityForResult(intent, 2);} catch (Exception e) {Toast.makeText(MainActivity.this, "请先安装图库", Toast.LENGTH_SHORT).show();}}/*** 跳转到图库*/public void goImageAlbum() {try {Intent intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);// 方法2// Intent intent = new Intent(Intent.ACTION_GET_CONTENT);// intent.addCategory(Intent.CATEGORY_OPENABLE);intent.setType("image/*"); // 设置文件类型startActivityForResult(intent, 1);// 转到图片} catch (Exception e) {Toast.makeText(MainActivity.this, "请先安装图库", Toast.LENGTH_SHORT).show();}}
}