//--------我的主布局文件------很简单--------------------------------- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"> <Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="gallery"
android:text="获取图库图片" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="camera"
android:text="拍照获取图片" /> <ImageView
android:id="@+id/iv_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout> //------------------我的MainActivity --------------也很简单--------------------------
package tackpicture.bwie.com.tackpicture; 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.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast; import java.io.File; public class MainActivity extends AppCompatActivity { private ImageView iv_image; 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
/* 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);
//找到控件
iv_image = (ImageView) findViewById(R.id.iv_image);
} //图库
public void camera(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);
} //相机
public void gallery(View view) {
// 激活相机
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
// 判断存储卡是否可以用,可用进行存储
if (hasSdcard()) {
tempFile = new File(Environment.getExternalStorageDirectory(), PHOTO_FILE_NAME);
// 从文件中创建uri
Uri uri = Uri.fromFile(tempFile);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
}
// 开启一个带有返回值的Activity,请求码为PHOTO_REQUEST_CAREMA
startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
} /*
* 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);
// 裁剪后输出图片的尺寸大小
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);
} }
//-----------------以上就完了----------------------------- 下面看一下怎么把图片的Bitmap保存到SharedPreferences
这篇博文来自 http://blog.csdn.net/lfdfhl/article/details/37914673;非常感谢作者的分享
MainActivity如下:
[java] view plaincopy
- package cc.sp;
- import java.io.ByteArrayInputStream;
- import java.io.ByteArrayOutputStream;
- import android.os.Bundle;
- import android.util.Base64;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.ImageView;
- import android.app.Activity;
- import android.content.Context;
- import android.content.SharedPreferences;
- import android.content.SharedPreferences.Editor;
- import android.graphics.Bitmap;
- import android.graphics.Bitmap.CompressFormat;
- import android.graphics.BitmapFactory;
- public class MainActivity extends Activity {
- private Button mSaveButton;
- private Button mGetButton;
- private ImageView mImageView;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- init();
- }
- private void init(){
- mSaveButton=(Button) findViewById(R.id.saveButton);
- mSaveButton.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View view) {
- saveBitmapToSharedPreferences();
- }
- });
- mGetButton=(Button) findViewById(R.id.getButton);
- mGetButton.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View view) {
- getBitmapFromSharedPreferences();
- }
- });
- mImageView=(ImageView) findViewById(R.id.imageView);
- }
- private void saveBitmapToSharedPreferences(){
- Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
- //第一步:将Bitmap压缩至字节数组输出流ByteArrayOutputStream
- ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();
- bitmap.compress(CompressFormat.PNG, 80, byteArrayOutputStream);
- //第二步:利用Base64将字节数组输出流中的数据转换成字符串String
- byte[] byteArray=byteArrayOutputStream.toByteArray();
- String imageString=new String(Base64.encodeToString(byteArray, Base64.DEFAULT));
- //第三步:将String保持至SharedPreferences
- SharedPreferences sharedPreferences=getSharedPreferences("testSP", Context.MODE_PRIVATE);
- Editor editor=sharedPreferences.edit();
- editor.putString("image", imageString);
- editor.commit();
- }
- private void getBitmapFromSharedPreferences(){
- SharedPreferences sharedPreferences=getSharedPreferences("testSP", Context.MODE_PRIVATE);
- //第一步:取出字符串形式的Bitmap
- String imageString=sharedPreferences.getString("image", "");
- //第二步:利用Base64将字符串转换为ByteArrayInputStream
- byte[] byteArray=Base64.decode(imageString, Base64.DEFAULT);
- ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(byteArray);
- //第三步:利用ByteArrayInputStream生成Bitmap
- Bitmap bitmap=BitmapFactory.decodeStream(byteArrayInputStream);
- mImageView.setImageBitmap(bitmap);
- }
- }
//-------------------------------布局文件------------------------------------ main.xml如下:
[html] view plaincopy
- <</span>RelativeLayout 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"
- >
- <</span>Button
- android:id="@+id/saveButton"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="保存图片到SharedPreferences"
- android:layout_centerHorizontal="true"
- android:layout_marginTop="25dip"/>
- <</span>Button
- android:id="@+id/getButton"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="从SharedPreferences获取图片"
- android:layout_centerHorizontal="true"
- android:layout_marginTop="80dip"/>
- <</span>ImageView
- android:id="@+id/imageView"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_centerInParent="true"
- />
- </</span>RelativeLayout>