我有ImageView我在其中使用Glide库将服务器中的照片加载到其中。
我有一个save按钮，我希望在加载后单击时将图像保存到图库和内部存储。我已经尝试了几种可能性但没有成功，因为单击按钮后似乎没有发生任何事情。
public class ImagePreviewActivity extends AppCompatActivity {
ImageView imageView;
final File myDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/SmartPhoto");
boolean success = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_preview);
imageView = findViewById(R.id.image_preview);
saveImage();
}
private void saveImage() {
TextView mSave = findViewById(R.id.save_img);
mSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
final String fname = "image" + n + ".png";
myDir.mkdirs();
File image = new File(myDir, fname);
imageView.setDrawingCacheEnabled(true);
Bitmap bitmap = imageView.getDrawingCache();
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
/* 100 to keep full quality of the image */
outStream.flush();
outStream.close();
success = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (success) {
Toast.makeText(getApplicationContext(),"Saved", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(),"not saved", Toast.LENGTH_LONG).show();
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
final Intent scanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
final Uri contentUri = Uri.fromFile(image);
scanIntent.setData(contentUri);
sendBroadcast(scanIntent);
} else {
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://mnt/sdcard/" + Environment.getExternalStorageDirectory())));
}
}
});
}
}
Log Cat
02-24 14:40:41.288 1567-1575/? E/System: Uncaught exception thrown by finalizer
02-24 14:40:41.289 1567-1575/? E/System: java.lang.IllegalStateException: Binder has been finalized!
at android.os.BinderProxy.transactNative(Native Method)
at android.os.BinderProxy.transact(Binder.java:622)
at android.net.INetworkStatsSession$Stub$Proxy.close(INetworkStatsSession.java:476)
at android.app.usage.NetworkStats.close(NetworkStats.java:382)
at android.app.usage.NetworkStats.finalize(NetworkStats.java:118)
at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:223)
at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:210)
at java.lang.Thread.run(Thread.java:761)
答案 0 :(得分：0)
//out oncreate
final File myDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/SmartPhoto");
boolean success = false;
//inside oncreate
mSave = (TextView) findViewById(R.id.save);
imageView = (ImageView) findViewById(R.id.header_cover_image);
mSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view)
{
saveImage();
}
});
public void saveImage()
{
final Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
final String fname = "image" + n + ".png";
myDir.mkdirs();
File image = new File(myDir, fname);
imageView.setDrawingCacheEnabled(true);
Bitmap bitmap = imageView.getDrawingCache();
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
/* 100 to keep full quality of the image */
outStream.flush();
outStream.close();
success = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (success) {
Toast.makeText(getApplicationContext(),"Saved", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(),"not saved", Toast.LENGTH_LONG).show();
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
final Intent scanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
final Uri contentUri = Uri.fromFile(image);
scanIntent.setData(contentUri);
sendBroadcast(scanIntent);
} else {
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://mnt/sdcard/" + Environment.getExternalStorageDirectory())));
}
}
答案 1 :(得分：0)
AsyncTask，可以用来下载Image。这个过程将在后台线程中。
class DownloadImage extends AsyncTask<String,Integer,Long> {
String strFolderName;
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Long doInBackground(String... aurl) {
int count;
try {
URL url = new URL((String) aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
String targetFileName="Name"+".rar";//Change name and subname
int lenghtOfFile = conexion.getContentLength();
String PATH = Environment.getExternalStorageDirectory()+ "/"+downloadFolder+"/";
File folder = new File(PATH);
if(!folder.exists()){
folder.mkdir();//If there is no folder it will be created.
}
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(PATH+targetFileName);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
protected void onPostExecute(String result) {
}
}
您可以像new DownloadImage().execute(“yoururl”);
不要忘记在清单文件中添加这些权限
<uses-permission android:name="android.permission.INTERNET"> </uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>