我最近有很好的精神来开发Android应用程序并且已经多次询问过android编程，所以如果我再问一遍就不要打扰：D（Intermezzo） 其实我遇到了一些问题。我已经完成了一个应用程序的开发，它在我的设备三星Note 10.1中工作得非常好。但是，当我将应用程序安装到其他设备时，我遇到了一些错误和问题 第一个，我的应用程序在使用相机捕获图像并按下按钮保存后崩溃。我正在使用意图打开相机。 第二个，在我进行裁剪活动后，裁剪后的图像无法在我自己的目录中写入，但目录存在。这是我的代码，如果你借给我我的帮助真的很高兴：）
MainActivity.java
package com.example.cobaandroid;
import java.io.InputStream;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
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;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tampilkanUserManual();
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);
}
//Cek apakah device memiliki kamera
private Boolean supportCamera()
{
if(getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA))
{
return true;
}
else return false;
}
// Button onClick
public void onClick(View v)
{
if(v.getId()==R.id.ambil_gambar)
{
try
{
//Intent untuk menggunakan kamera
Intent intentAmbil = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
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 untuk ngambil gambar di galeri
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);
}
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.inSampleSize = 8;
option.inJustDecodeBounds = true;
Bitmap hasilPoto = (Bitmap) data.getExtras().get("data");
if(hasilPoto==null)
{
Toast.makeText(getApplicationContext(), "bitmap null", Toast.LENGTH_LONG).show();
}
picUri = data.getData();
Toast.makeText(getApplicationContext(), picUri.getPath(), Toast.LENGTH_LONG).show();
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 gambar dari galeri
Uri galeriUri = data.getData();
String[] path = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(galeriUri,path,null,null,null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(path[0]);
String gambarPath = cursor.getString(columnIndex);
cursor.close();
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inJustDecodeBounds = true;
opt.inSampleSize = calculateInSampleSize(opt, 50, 100);
Bitmap hasilPoto = BitmapFactory.decodeFile(gambarPath);
//Bitmap hasilPoto = BitmapFactory.decodeFile(gambarPath, opt);
hasilPoto = scaleDown(hasilPoto, 100, getApplicationContext());
Intent cropIntents = new Intent(this,Crop.class);
cropIntents.putExtra("data", galeriUri.toString());
cropIntents.putExtra("kode","galeri");
cropIntents.putExtra("gambar",hasilPoto);
cropIntents.putExtra("path", gambarPath);
startActivity(cropIntents);
}
}
}
//fungsi untuk scaling gambar
private Bitmap scaleDown(Bitmap photo, int newHeight,Context contex)
{
final float densityMultiplier = contex.getResources().getDisplayMetrics().density;
int h = (int) (newHeight*densityMultiplier);
int w = (int) (h*photo.getWidth()/(double)photo.getHeight());
photo = Bitmap.createScaledBitmap(photo, w, h, true);
return photo;
}
//tampilkan userManual
private void tampilkanUserManual()
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
LayoutInflater inflater = this.getLayoutInflater();
View view = inflater.inflate(R.layout.activity_usermanual, null);
builder.setView(view);
builder.setPositiveButton("Ok", null);
AlertDialog dialog = builder.create();
dialog.show();
}
}
在MainActivity.java中的我正在使用相机和图库，用户可以从图库中选择图像或使用相机捕获图像。 这是xml
<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"
android:background="@drawable/daun2"
android:orientation="horizontal"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/showTextHome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="@string/showText"
android:textSize="40sp" />
<Button
android:id="@+id/exit"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Keluar" />
<Button
android:id="@+id/ambil_gambar"
android:layout_width="276dp"
android:layout_height="wrap_content"
android:layout_above="@+id/ambilGallery"
android:layout_alignRight="@+id/showTextHome"
android:text="@string/ambil" />
<Button
android:id="@+id/ambilGallery"
android:layout_width="276dp"
android:layout_height="wrap_content"
android:layout_above="@+id/exit"
android:layout_alignLeft="@+id/ambil_gambar"
android:layout_marginBottom="26dp"
android:text="@string/ambilGall" />
用户选择或捕获图像后，意图调用下一个活动Crop.java。在这个类中，用户可以裁剪图像并自动将其保存到名为“数据集”的目录
package com.example.cobaandroid;
import java.io.File;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class Crop extends Activity {
public static int[] rataRed ;
public static int[] rataGreen ;
public static int[] rataBlue ;
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("Gambar diambil dari kamera");
}
else if(intentKode.equals("galeri"))
{
String path = getIntent().getParcelableExtra("path");
Bitmap bmp = getIntent().getParcelableExtra("gambar");
img.setImageBitmap(bmp);
System.out.println("Gambar diambil dari galeri");
}
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
{
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("crop","true");
intentCrop.putExtra("AspectX", 0);
intentCrop.putExtra("AspectY", 0);
intentCrop.putExtra("outputX", 256);
intentCrop.putExtra("outputY", 256);
intentCrop.putExtra("return-data",true);
intentCrop.putExtra(MediaStore.EXTRA_OUTPUT, tempUri);
startActivityForResult(intentCrop, PIC_CROP);
}
catch(ActivityNotFoundException activity)
{
}
}
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);
Toast.makeText(getApplicationContext(), dir.getAbsolutePath(), Toast.LENGTH_LONG).show();
int jumlahFile = cekDirektoriDataSet(dir);
if(jumlahFile > 0)
{
Intent listIntent = new Intent(Crop.this,DataSet.class);
listIntent.putExtra("uri", fileUri.toString());
Crop.this.startActivity(listIntent);
}
else
{
Toast toast = Toast.makeText(getApplicationContext(),"Tidak ada citra di direktroi Dataset", Toast.LENGTH_LONG);
toast.show();
}
}
});
}
// 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");
Toast.makeText(getApplicationContext(), mediaFile.getPath(), Toast.LENGTH_LONG).show();
}
else return null;
return mediaFile;
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth,int reqHeight)
{
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if(height > reqHeight || width > reqWidth)
{
final int halfHeight = height/2;
final int halfWidth = width/2;
while((halfHeight/inSampleSize)>reqHeight && (halfWidth/inSampleSize)>reqWidth)
{
inSampleSize*=2;
}
long totalPixels = width*height/inSampleSize;
final long totalReqPixelsCap = reqWidth*reqHeight*2;
while(totalPixels > totalReqPixelsCap)
{
inSampleSize*=2;
totalPixels/=2;
}
}
return inSampleSize;
}
private Bitmap scaleDown(Bitmap photo, int newHeight,Context contex)
{
final float densityMultiplier = contex.getResources().getDisplayMetrics().density;
int h = (int) (newHeight*densityMultiplier);
int w = (int) (h*photo.getWidth()/(double)photo.getHeight());
photo = Bitmap.createScaledBitmap(photo, w, h, true);
return photo;
}
//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;
}
}
这是作物的xml
<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"
android:layout_gravity="center"
android:background="@drawable/daun2"
android:orientation="horizontal"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/gambarPoto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/list"
android:layout_alignParentLeft="true"
android:layout_marginBottom="86dp"
android:contentDescription="@string/gambar"
android:src="@drawable/ic_launcher" />
<Button
android:id="@+id/cropButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/gambarPoto"
android:layout_alignParentBottom="true"
android:layout_marginBottom="28dp"
android:layout_marginLeft="14dp"
android:text="@string/crop" />
<TextView
android:id="@+id/showCrop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="@string/showTextCrop"
android:textAlignment="textStart"
android:textSize="18sp"
android:textStyle="italic|bold" />
<Button
android:id="@+id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/cropButton"
android:layout_alignBottom="@+id/cropButton"
android:layout_alignRight="@+id/gambarPoto"
android:text="@string/Dataset" />
我真的需要你的帮助 非常感谢...