Android开发 点击在本地选择换图片（头像）并且保存，实例总结。

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
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.view.Window;
import android.widget.Button;
import android.widget.ImageView;
import com.igbs_phone.R;

public class Personaldata extends Activity {

/**
* @param args
*/
ImageView image_qq1;
private Bitmap head;// 头像Bitmap
@SuppressLint("SdCardPath")
private static String path = "/sdcard/myHead/";// sd路径
// private static String path=Environment
// .getExternalStorageDirectory().getPath()+"/ilex_image";
Button imageButton, queren_button;
FragmentTransaction fragmentTransaction;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.personaldata);
image_qq1 = (ImageView) findViewById(R.id.image_qq1);
image_qq1.setBackgroundColor(Color.TRANSPARENT);
imageButton = (Button) findViewById(R.id.re_bt);
queren_button = (Button) findViewById(R.id.queren_button);
image_qq1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
startActivityForResult(intent, 1);
}
});
imageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
onBackPressed();
}
});
// 头像转换确定按钮监听
queren_button.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
// 点击变换头像 确定按钮监听！

}
});
}

@Override
public void onStart() {
super.onStart();
Bitmap bt = getBitmap(path + "head.jpg");
if (bt != null) {
@SuppressWarnings("deprecation")
Drawable drawable = new BitmapDrawable(bt);
image_qq1.setImageDrawable(drawable);

} else {

}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case 1:
if (resultCode == RESULT_OK) {
cropPhoto(data.getData());// 裁剪图片
}

break;
case 2:
if (resultCode == RESULT_OK) {
File temp = new File(Environment.getExternalStorageDirectory()
+ "/head.jpg");
cropPhoto(Uri.fromFile(temp));// 裁剪图片
}

break;
case 3:
if (data != null) {
Bundle extras = data.getExtras();
head = extras.getParcelable("data");
if (head != null) {
/**
* 上传服务器代码
*/

// head = toRoundBitmap1(head);//调用圆角处理方法
setPicToView(head);// 保存在SD卡中
image_qq1.setImageBitmap(head);// 用ImageView显示出来
if (head != null && head.isRecycled()) {
head.recycle();
}

}
}
break;
default:
break;

}
super.onActivityResult(requestCode, resultCode, data);
};
/**
* 调用系统的裁剪
*
* @param uri
*/
public void cropPhoto(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// outputX outputY 是裁剪图片宽高
intent.putExtra("outputX", 150);
intent.putExtra("outputY", 150);
intent.putExtra("return-data", true);
startActivityForResult(intent, 3);
}

private void setPicToView(Bitmap mBitmap) {
String sdStatus = Environment.getExternalStorageState();
if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用
return;
}
FileOutputStream b = null;
File file = new File(path);
file.mkdirs();// 创建文件夹
String fileName = path + "head.jpg";// 图片名字
try {
b = new FileOutputStream(fileName);
mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
try {
// 关闭流
b.flush();
b.close();
} catch (IOException e) {
e.printStackTrace();
}

}
}

// 从本地的文件中以保存的图片中 获取图片的方法
private Bitmap getBitmap(String pathString) {
Bitmap bitmap = null;
try {
File file = new File(pathString);
if (file.exists()) {
bitmap = BitmapFactory.decodeFile(pathString);
}
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}

}

// 从本地的文件中以保存的图片中 获取图片的方法
private Bitmap getBitmap(String pathString) {
Bitmap bitmap = null;
try {
File file = new File(pathString);
if (file.exists()) {
bitmap = BitmapFactory.decodeFile(pathString);
}
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}

@SuppressLint("SdCardPath")
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
String path1 = "/sdcard/myHead/";// sd路径
Bitmap bt = getBitmap(path1 + "head.jpg");
if (bt != null) {
@SuppressWarnings("deprecation")
Drawable drawable = new BitmapDrawable(bt);
image_qq.setImageDrawable(drawable);
}
}