我正在构建使用相机作为主要功能的Android应用程序。我正在使用意图打开原生相机，但在我捕获并按下保存按钮后，应用程序返回主要活动。我想在下一个活动中显示捕获的图像，因为我想裁剪捕获的图像。 这是我的代码
package com.example.cobaandroid;
public class MainActivity extends Activity implements OnClickListener {
final int PICTURE_GALLERY = 0;
final int CAMERA_CAPTURE = 1;
final int PIC_CROP = 2;
public static final int MEDIA_IMAGE = 3;
private Uri picUri;
Uri imgFileUri ;
File cameraFile;
String imageFilepath = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tampilkanUserManual();
//getApplicationContext().deleteDatabase("score.db");
Button ambilGambar = (Button)findViewById(R.id.ambil_gambar);
Button gallery = (Button) findViewById(R.id.ambilGallery);
ambilGambar.setOnClickListener(this);
gallery.setOnClickListener(this);
if(!supportCamera())
{
Toast.makeText(getApplicationContext(), "Maaf device anda tidak mendukung penggunaan kamera", Toast.LENGTH_LONG).show();
finish();
}
Button exit = (Button)findViewById(R.id.exit);
exit.setOnClickListener(this);
}
// Button onClick
public void onClick(View v)
{
if(v.getId()==R.id.ambil_gambar)
{
try
{
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_HHmmss");
String fileName = "IMG_" + dateFormat.format(new Date()) + ".jpg";
File myDirectory = new File(Environment.getExternalStorageDirectory()+ "/DCIM/Camera");
cameraFile = new File(myDirectory,fileName);
picUri = Uri.fromFile(cameraFile);
Intent intentAmbil = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intentAmbil.putExtra(MediaStore.EXTRA_OUTPUT, picUri);
startActivityForResult(intentAmbil,CAMERA_CAPTURE);
}
catch(ActivityNotFoundException activity)
{
String errorMessage = "ga support kamera";
Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
toast.show();
}
}
else if(v.getId()==R.id.ambilGallery)
{
try
{
//intent pick from gallery
Intent ambilGallery = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
ambilGallery.setType("image/*");
startActivityForResult(ambilGallery, PICTURE_GALLERY);
}
catch(ActivityNotFoundException activity)
{
String errorMessage = "Tidak dapat mengambil gambar dari galeri";
Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
toast.show();
}
}
else if(v.getId()==R.id.exit)
{
try
{
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();
}
catch(ActivityNotFoundException ac)
{
Toast.makeText(getApplicationContext(), "Tidak dapat menutup aplikasi", Toast.LENGTH_LONG).show();
}
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
if(resultCode==RESULT_OK)
{
if(requestCode==CAMERA_CAPTURE)
{
BitmapFactory.Options option = new BitmapFactory.Options();
option.inJustDecodeBounds = false;
Bitmap hasilPoto = BitmapFactory.decodeFile(cameraFile.toString(),option);
Intent cropIntent= new Intent (this, Crop.class);
cropIntent.putExtra("data", picUri.toString());
cropIntent.putExtra("gambar", hasilPoto);
cropIntent.putExtra("kode","kamera");
startActivity(cropIntent);
}
else if(requestCode==PICTURE_GALLERY)
{
// Resize picture
Uri galeriUri = data.getData();
Bitmap hasilPoto = null;
try {
hasilPoto = decodeUri(galeriUri);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Intent cropIntents = new Intent(this,Crop.class);
cropIntents.putExtra("data", galeriUri.toString());
cropIntents.putExtra("kode","galeri");
cropIntents.putExtra("gambar",hasilPoto);
startActivity(cropIntents);
}
}
}
private Bitmap decodeUri(Uri selectedImage) throws FileNotFoundException {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(
getContentResolver().openInputStream(selectedImage), null, o);
final int REQUIRED_SIZE = 100;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE) {
break;
}
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(
getContentResolver().openInputStream(selectedImage), null, o2);
}
}
这里是Crop.java
package com.example.cobaandroid;
public class Crop extends Activity {
final int PIC_CROP = 2;
final int levelBWd = 6;
public static final int MEDIA_IMAGE = 3;
private static final String IMAGE_DIRECTORY_NAME = "Dataset";
private Uri fileUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_crop);
ImageView img = (ImageView) findViewById(R.id.gambarPoto);
String uriPassed = getIntent().getStringExtra("data");
fileUri = Uri.parse(uriPassed);
String intentKode = getIntent().getStringExtra("kode");
if(intentKode.equals("kamera"))
{
Bitmap bmp = getIntent().getParcelableExtra("gambar");
img.setImageBitmap(bmp);
System.out.println("Image captured using camera");
}
else if(intentKode.equals("galeri"))
{
Bitmap bmp = getIntent().getParcelableExtra("gambar");
img.setImageBitmap(bmp);
System.out.println("pick from gallery");
}
Button cropButton = (Button) findViewById(R.id.cropButton);
cropButton.setOnClickListener(new View.OnClickListener() {
int hasCroped = 0;
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
File dir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),IMAGE_DIRECTORY_NAME);
int jumlahFile = cekDirektoriDataSet(dir);
if(jumlahFile==0)
{
Toast.makeText(getApplicationContext(), "Anda belum melakukan Crop", Toast.LENGTH_LONG).show();
}
if(jumlahFile < levelBWd)
{
try
{
hasCroped = jumlahFile;
if(jumlahFile !=0)Toast.makeText(getApplicationContext(), "Anda sudah melakukan Crop sebanyak "+hasCroped, Toast.LENGTH_LONG).show();
hasCroped++;
Intent intentCrop = new Intent("com.android.camera.action.CROP");
intentCrop.setDataAndType(fileUri, "image/*");
Uri tempUri = fileUri;
tempUri = getOutputMediaFileUri(MEDIA_IMAGE);
intentCrop.putExtra("scale","true");
intentCrop.putExtra("AspectX", 1);
intentCrop.putExtra("AspectY", 1);
intentCrop.putExtra("outputX", 150);
intentCrop.putExtra("outputY", 150);
intentCrop.putExtra("return-data",false);
intentCrop.putExtra(MediaStore.EXTRA_OUTPUT, tempUri);
startActivityForResult(intentCrop, PIC_CROP);
}
catch(ActivityNotFoundException activity)
{
activity.setStackTrace(null);
}
}
else
{
Toast.makeText(getApplicationContext(), "Tidak dapat melakukan crop melebihi jumlah level warna BWD", Toast.LENGTH_LONG).show();
}
}
});
// DataSet ListView dan Hitung RGB
Button view = (Button)findViewById(R.id.list);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File dir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),IMAGE_DIRECTORY_NAME);
int jumlahFile = cekDirektoriDataSet(dir);
if(jumlahFile > 0)
{
Intent listIntent = new Intent(Crop.this,DataSet.class);
listIntent.putExtra("uri", fileUri.toString());
Crop.this.startActivity(listIntent);
finish();
}
else
{
Toast toast = Toast.makeText(getApplicationContext(),"Tidak ada citra di direktroi Dataset", Toast.LENGTH_LONG);
toast.show();
}
}
});
}
@Override
public void onBackPressed()
{
HapusIsiDir hapusDir = new HapusIsiDir();
hapusDir.hapusDirektori(new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"Dataset"));
hapusDir.hapusDirektori(new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"Datatest"));
finish();
}
// store gambar (file URI)
public Uri getOutputMediaFileUri (int type)
{
return Uri.fromFile(getOutputMediaFile(type));
}
private File getOutputMediaFile (int type)
{
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),IMAGE_DIRECTORY_NAME);
//buat media file name
int indexGambar = cekDirektoriDataSet(mediaStorageDir);
File mediaFile;
if (type == MEDIA_IMAGE)
{
mediaFile = new File(mediaStorageDir.getPath() + File.separator + (indexGambar+1)+".jpg");
}
else return null;
return mediaFile;
}
//cek jumlah atau isi direktori
private int cekDirektoriDataSet(File dir)
{
if(!dir.exists())
{
if(!dir.mkdir())
{
Log.d(IMAGE_DIRECTORY_NAME, "Gagal membuat direktori" + IMAGE_DIRECTORY_NAME + "direktori");
}
}
File[] listDir = dir.listFiles();
return listDir.length;
}
}
我需要你的帮助，非常感谢你的关注......
这是logcat
12 15:36:10.994: E/AndroidRuntime(30866): FATAL EXCEPTION: main
12-12 15:36:10.994: E/AndroidRuntime(30866): Process: com.example.cobaandroid, PID: 30866
12-12 15:36:10.994: E/AndroidRuntime(30866): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.example.cobaandroid/com.example.cobaandroid.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.toString()' on a null object reference
12-12 15:36:10.994: E/AndroidRuntime(30866): at and roid.app.ActivityThread.deliverResults(ActivityThread.java:3368)
12-12 15:36:10.994: E/AndroidRuntime(30866): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3411)
12-12 15:36:10.994: E/AndroidRuntime(30866): at android.app.ActivityThread.access$1300(ActivityThread.java:138)
12-12 15:36:10.994: E/AndroidRuntime(30866): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
12-12 15:36:10.994: E/AndroidRuntime(30866): at android.os.Handler.dispatchMessage(Handler.java:102)
12-12 15:36:10.994: E/AndroidRuntime(30866): at android.os.Looper.loop(Looper.java:136)
12-12 15:36:10.994: E/AndroidRuntime(30866): at android.app.ActivityThread.main(ActivityThread.java:5050)
12-12 15:36:10.994: E/AndroidRuntime(30866): at java.lang.reflect.Method.invoke(Native Method)
12-12 15:36:10.994: E/AndroidRuntime(30866): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
12-12 15:36:10.994: E/AndroidRuntime(30866): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
12-12 15:36:10.994: E/AndroidRuntime(30866): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.toString()' on a null object reference
12-12 15:36:10.994: E/AndroidRuntime(30866): at com.example.cobaandroid.MainActivity.onActivityResult(MainActivity.java:222)
12-12 15:36:10.994: E/AndroidRuntime(30866): at android.app.Activity.dispatchActivityResult(Activity.java:5433)
12-12 15:36:10.994: E/AndroidRuntime(30866): at android.app.ActivityThread.deliverResults(ActivityThread.java:3364)
12-12 15:36:10.994: E/AndroidRuntime(30866): ... 9 more
12-12 15:36:14.147: I/Process(30866): Sending signal. PID: 30866 SIG: 9
12-12 15:46:38.153: I/Adreno-EGL(31795): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM build: (CL3776187)
12-12 15:46:38.153: I/Adreno-EGL(31795): OpenGL ES Shader Compiler Version:
12-12 15:46:38.153: I/Adreno-EGL(31795): Build Date: 10/15/13 Tue
12-12 15:46:38.153: I/Adreno-EGL(31795): Local Branch:
12-12 15:46:38.153: I/Adreno-EGL(31795): Remote Branch: partner/upstream
12-12 15:46:38.153: I/Adreno-EGL(31795): Local Patches:
12-12 15:46:38.153: I/Adreno-EGL(31795): Reconstruct Branch:
12-12 15:46:38.183: D/OpenGLRenderer(31795): Enabling debug mode 0
12-12 15:46:45.811: E/JavaBinder(31795): !!! FAILED BINDER TRANSACTION !!!