从相册选择图片回传

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="chenshanshan.baway.com.mclearedittext.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="gallery"
        android:text="获取图库图片" />

    <ImageView
        android:id="@+id/iv_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


LinearLayout>

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
public class MainActivity extends Activity {

private static final int PHOTO_REQUEST_CAREMA = 1; // 拍照
private static final int PHOTO_REQUEST_GALLERY = 2; // 从相册中选择
private static final int PHOTO_REQUEST_CUT = 3; // 结果
private ImageView iv_image; /* 头像名称 */
private static final String PHOTO_FILE_NAME = "temp_photo.jpg";
private File tempFile;

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

this. iv_image = (ImageView) this.findViewById(R.id. iv_image);


}

/* * 从相册获取 */
public void gallery(View view) {

// 激活系统图库，选择一张图片
Intent intent = new Intent(Intent. ACTION_PICK);
intent.setType( "image/*");
// 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_GALLERY
startActivityForResult(intent, PHOTO_REQUEST_GALLERY);

}

/* * 剪切图片 */
private void crop(Uri uri) {
// 裁剪图片意图
Intent intent = new Intent( "com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra( "crop", "true");
// 裁剪框的比例，1：1
intent.putExtra( "aspectX", 1);
intent.putExtra( "aspectY", 1);
intent.putExtra( "outputX", 250);
intent.putExtra( "outputY", 250);
intent.putExtra( "outputFormat", "JPEG");
// 图片格式
intent.putExtra( "noFaceDetection", true);
// 取消人脸识别

intent.putExtra( "return-data", true);
// 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUT
startActivityForResult(intent, PHOTO_REQUEST_CUT);

}

/* * 判断sdcard是否被挂载 */
private boolean hasSdcard() {
if (Environment. getExternalStorageState().equals(
Environment. MEDIA_MOUNTED)) {
return true;
} else {
return false;
}

}


@Override
protected void onActivityResult( int requestCode, int resultCode, Intent data) {
if (requestCode == PHOTO_REQUEST_GALLERY) {
// 从相册返回的数据
if (data != null) {
// 得到图片的全路径
Uri uri = data.getData();
crop(uri);
}
} else if (requestCode == PHOTO_REQUEST_CAREMA) {
// 从相机返回的数据
if (hasSdcard()) {
crop(Uri. fromFile( tempFile));
} else {
Toast. makeText(MainActivity. this, "未找到存储卡，无法存储照片！", 0).show();
}
} else if (requestCode == PHOTO_REQUEST_CUT) {
// 从剪切图片返回的数据
if (data != null) {

Bitmap bitmap = data.getParcelableExtra( "data");
this. iv_image.setImageBitmap(bitmap);

}

try {
// 将临时文件删除
tempFile.delete();
} catch (Exception e) {
e.printStackTrace();
}
}
super.onActivityResult(requestCode, resultCode, data);
}
}