调用系统相机拍照，保存照片，调用系统裁剪API对照片处理，显示裁剪之后的照片

package com.pingyijinren.test;

import android.annotation.TargetApi;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.ContentResolver;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;
import java.io.FileNotFoundException;

public class MainActivity extends AppCompatActivity{
private Button button;
private ImageView imageView;
private Uri uri;
private File file;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

button=(Button)findViewById(R.id.button);
imageView=(ImageView)findViewById(R.id.imageView);

button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
file=null;
try{
file=new File(Environment.getExternalStorageDirectory()+"/test.jpg");

if(file.exists()){
file.delete();
}
file.createNewFile();

uri= Uri.fromFile(file);

Intent intent=new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT,uri);
startActivityForResult(intent, 1);
}
catch(Exception e){}
}
});
}

@Override
protected void onActivityResult(int requestCode,int resultCode,Intent data){
if(requestCode==1){
Intent cropIntent=new Intent("com.android.camera.action.CROP");
cropIntent.setDataAndType(uri,"image/*");
cropIntent.putExtra("scale",true);
cropIntent.putExtra(MediaStore.EXTRA_OUTPUT,uri);
startActivityForResult(cropIntent,2);
}
else if(requestCode==2){
try{
Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
imageView.setImageBitmap(bitmap);
}
catch(Exception e){}

}
}
}