Java 从SD存储器到ByteArray的映像
编辑：我不知道如何将一个图像文件（example.jpg）转换成byteArray。我试图理解它是如何完成的，但到目前为止我什么都没有，我尝试了在这个网站上找到的不同方法，但似乎对我来说没有任何效果。 我在这里提出了问题，这样我就可以理解在其他人的帮助下是如何做到的 我的SD卡中有一个图像文件，我知道我的路径，现在我想获取该图像并将其转换为byteArray，我在logcat中得到了错误的结果，我想我是这样做的。我不确定输出应该是怎样的Java 从SD存储器到ByteArray的映像,java,android,arrays,Java,Android,Arrays,编辑：我不知道如何将一个图像文件（example.jpg）转换成byteArray。我试图理解它是如何完成的，但到目前为止我什么都没有，我尝试了在这个网站上找到的不同方法，但似乎对我来说没有任何效果。 我在这里提出了问题，这样我就可以理解在其他人的帮助下是如何做到的 我的SD卡中有一个图像文件，我知道我的路径，现在我想获取该图像并将其转换为byteArray，我在logcat中得到了错误的结果，我想我是这样做的。我不确定输出应该是怎样的 import android.content.Intent
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.StrictMode;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.awareness.snapshot.internal.Snapshot;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.Circle;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.GoogleMap.SnapshotReadyCallback;
import com.google.android.gms.maps.GoogleMap.OnMapLoadedCallback;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.util.Date;
import java.util.Map;
import static android.R.attr.bitmap;
import static android.R.attr.duration;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
public byte[] B;
private GoogleMap mMap;
GPSTracker gps;
public File imageFile ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
/**
Create the map when the map is ready OnMapReady, The object GPS is ccalled (GPSTraccker) to obtain
Values for lat and long.
*/
final Handler handler = new Handler();
@Override
public void onMapReady(final GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
gps = new GPSTracker(MapsActivity.this);
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
LatLng sydney = new LatLng(latitude, longitude);
//adding an automated marker to mark the users spot on the map.
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Cyprus"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
mMap.animateCamera(CameraUpdateFactory.zoomTo(19.0f));
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
//When the map is clicked the following will occure
@Override
public void onMapClick(LatLng point) {
//create a new marker on the new lat/long of the spot clicked
MarkerOptions marker = new MarkerOptions().position(
new LatLng(point.latitude, point.longitude)).title("New Marker");
//places the marker
mMap.addMarker(marker);
//create an object of Bitmap
Bitmap bitmap;
//Creating and calling object Snapshot
SnapshotReadyCallback callback = new SnapshotReadyCallback() {
@Override
//when the snapshot is ready do the following
public void onSnapshotReady(Bitmap bitmap) {
//Creating object Date and storing it to now
Date now = new Date();
//Retribing exact date and storing it to now
android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);
try {
//dissabling strick mode for testing , remember to remvoe this code
StrictMode.ThreadPolicy old = StrictMode.getThreadPolicy();
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder(old)
.permitDiskWrites()
.build());
//mpath = /sd/date.jpg creating a dir for the image to be snaped
String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
//Calling object File.
File imageFile = new File(mPath);
FileOutputStream out = new FileOutputStream(imageFile);
//outputing streaming to /imagefile
bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
Log.d("Var:OUT: ", " " + out);
Log.d("ImageFile" ,""+ imageFile) ;
Log.d("mPath" ,""+ mPath) ;
//decompose image
Bitmap bmp = BitmapFactory.decodeFile(mPath);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
StrictMode.setThreadPolicy(old);
ByteArrayOutputStream streams = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, streams);
bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
byte[] image=stream.toByteArray();
System.out.println("byte array:"+image);
Log.d("array", image.toString());
String img_str = Base64.encodeToString(image, 0);
Log.d("array_Str",img_str);
System.out.println("string:"+img_str);
} catch (Exception e) {
e.printStackTrace();
}
}
};
mMap.snapshot(callback);
System.out.println(point.latitude + "---" + point.longitude);
}
});
}
// public byte[] getBytesFromBitmap(Bitmap bitmap) {
// ByteArrayOutputStream stream = new ByteArrayOutputStream();
// bitmap.compress(Bitmap.CompressFormat.JPEG, 90, now);
//// Log.d("ARRAY", "" + now.toByteArray());
// byte[] B = stream.toByteArray();
// return stream.toByteArray();
//}
public void onSnapshotReady (Bitmap bitmap) {
Date now = new Date();
android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);
Log.d("DOulefko","test");
try {
// image naming and path to include sd card appending name you choose for file
String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
// create bitmap screen capture
View v1 = getWindow().getDecorView().getRootView();
v1.setDrawingCacheEnabled(true);
bitmap = Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
File imageFile = new File(mPath);
FileOutputStream outputStream = new FileOutputStream(imageFile);
int quality = 100;
bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
outputStream.flush();
outputStream.close();
} catch (Throwable e) {
// Several error may come out with file handling or OOM
e.printStackTrace();
}
}
private void openScreenshot(File imageFile) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(imageFile);
intent.setDataAndType(uri, "image/*");
startActivity(intent);
}
}
：19f8f74，Iac38d51750 建造日期：2016年6月6日 OpenGL ES着色器编译器版本：XE031.07.00.01 当地分支机构：案例2489916\u取消映射\u崩溃 远程分支： 远程分支： 重建分支：11-15 11:46:25.712 19702-19717/com.example.apostolis.gpsapi15 I/OpenGLRenderer: 已初始化EGL，版本1.4 11-15 11:46:25.721 19702-19702/com.example.apostolis.gpsapi15 D/AbstractTracker:事件 成功11-15 11:46:25.725 19702-19702/com.example.apostolis.gpsapi15 D/AbstractTracker:事件成功11-15 11:46:25.740 19702-19717/com.example.apostolis.gpsapi15 E/HAL:负载： 格拉洛克msm8996.so 11-15 11:46:37.663 19702-19702/com.example.apostolis.gpsapi15 D/AppTracker:App事件： 开始11-15 11:46:37.705 19702-19702/com.example.apostolis.gpsapi15 D/AbstractTracker:事件成功11-15 11:46:38.715 19702-19702/com.example.apostolis.gpsapi15 D/LocationManager： 请求位置更新 listener=com.example.apostolis.gpsapi15。GPSTracker@f1972c8 packageName=com.example.apostolis.gpsapi15 11-15 11:46:38.718 19702-19702/com.example.apostolis.gpsapi15 D/网络：网络11-15 11:46:38.735 19702-19702/com.example.apostolis.gpsapi15 D/AppTracker： 应用程序事件：停止11-15 11:46:38.749 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow:state.preset =假，颜色：0，半透明=0 11-15 11:46:38.749 19702-19702/com.exampl
byte[] fullyReadFileToBytes(File f) throws IOException {
int size = (int) f.length();
byte bytes[] = new byte[size];
byte tmpBuff[] = new byte[size];
FileInputStream fis= new FileInputStream(f);;
try {
int read = fis.read(bytes, 0, size);
if (read < size) {
int remain = size - read;
while (remain > 0) {
read = fis.read(tmpBuff, 0, remain);
System.arraycopy(tmpBuff, 0, bytes, size - remain, read);
remain -= read;
}
}
} catch (IOException e){
throw e;
} finally {
fis.close();
}
return bytes;
}
byte[] byteArray = fullyReadFileToBytes(imageFile);
Log.d("Activity", "Byte array: "+ Arrays.toString(byteArray));`