实际效果图:
代码实现:
- 权限配置
- 点击事件绑定
- 相册访问
- 根据路径设置图片
- 其他方法
权限
首先,现在 mainfest.xml 文件中添加以下权限:
代码语言:javascript复制<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
点击事件
点击跳转相册
代码语言:javascript复制imageView01.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(ContextCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(MainActivity.this,new String[]{
Manifest.permission.WRITE_EXTERNAL_STORAGE
},1);
}
Intent intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, IMAGE_REQUEST_CODE);
}
});
不同手机返回图片uri不同,此处进行转换
可以不添加( 如果,不添加,则其他方法也没用 )
代码语言:javascript复制 @TargetApi(19)
private void handleImageOmKitKat(Intent data){
String imagePath = null;
Uri uri = data.getData();
if (DocumentsContract.isDocumentUri(this,uri)){
//如果document类型是U日,则通过document id处理
String docId = DocumentsContract.getDocumentId(uri);
if ("com.android.providers.media.documents".equals(uri.getAuthority())){
String id = docId.split(":")[1];//解析出数字格式id
String selection = MediaStore.Images.Media._ID "=" id;
imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection);
}else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())){
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),Long.valueOf(docId));
imagePath = getImagePath(contentUri,null);
}
}else if ("content".equalsIgnoreCase(uri.getScheme())){
//如果是普通类型 用普通方法处理
imagePath = getImagePath(uri,null);
}else if ("file".equalsIgnoreCase(uri.getScheme())){
//如果file类型位uri直街获取图片路径即可
imagePath = uri.getPath();
}
displayImage(imagePath);
}
关于方法:onActivityResult()
代码语言:javascript复制@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//在相册里面选择好相片之后调回到现在的这个activity中
switch (requestCode) {
case IMAGE_REQUEST_CODE://这里的requestCode是我自己设置的,就是确定返回到那个Activity的标志
if (resultCode == RESULT_OK) {//resultcode是setResult里面设置的code值
try {
Uri selectedImage = data.getData(); //获取系统返回的照片的Uri
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);//从系统表中查询指定Uri对应的照片
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
path = cursor.getString(columnIndex); //获取照片路径
cursor.close();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 1;
bitmap = BitmapFactory.decodeFile(path,options);
imageView01.setImageBitmap(bitmap);
chnage();
Toast.makeText(MainActivity.this,path,Toast.LENGTH_SHORT).show();
} catch (Exception e) {
// TODO Auto-generatedcatch block
e.printStackTrace();
}
}
break;
}
}
在这里通过放回路径设置头像,但由于图片路径生成可能有一定延时,所以这里开一个线程等待:
代码语言:javascript复制/*定义一个Handler,定义延时执行的行为*/
public void chnage(){
new Thread(){
@Override
public void run() {
while ( bitmap == null ){
bitmap = BitmapFactory.decodeFile(path);
Log.v("qwe","123");
}
Message message = handler.obtainMessage();
message.obj = 0;
handler.sendMessage(message);
}
}.start();
}
其他方法:
代码语言:javascript复制private void handleImageBeforeKitKat(Intent data){
Uri uri = data.getData();
String imagePath = getImagePath(uri,null);
displayImage(imagePath);
}
private String getImagePath(Uri uri, String selection){
String path = null;
//通过Uri和selection来获取真实图片路径
Cursor cursor = getContentResolver().query(uri, null, selection, null, null);
if (cursor != null){
if (cursor.moveToFirst()){
path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
}
cursor.close();
}
return path;
}
private void displayImage(String imagePath){
if (imagePath != null){
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
imageView01.setImageBitmap(bitmap);
}else {
Toast.makeText(MainActivity.this,"fail to get image",Toast.LENGTH_SHORT).show();
}
}
相关变量:
代码语言:javascript复制//从相册获得图片
Bitmap bitmap;
//判断返回到的Activity
private static final int IMAGE_REQUEST_CODE = 0;
//图片路径
private String path ;
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
if((Integer)msg.obj==0){
imageView01.setImageBitmap(bitmap);
}
super.handleMessage(msg);
}
};
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