经过多次尝试缩小图像尺寸后，我实际上可以成功;但是在我尝试查看已缩小的图像后，我的应用程序仍无法正常工作。这是代码 -
package com.example.tg_db1;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.media.ThumbnailUtils;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
public class add_company extends Activity{
ImageView iv;
Button b1,b2,b3;
EditText et1, et2;
RegistrationAdapter adapter;
RegistrationOpenHelper helper;
private static final int REQUEST_CODE = 1;
private String logopath;
String imgPath = null;
private Bitmap ThumbImage;
//Adding for voice record
ImageButton play,record,stop;
private String voicerec=null;
MediaPlayer mp;
MediaRecorder mr;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.add_company);
iv = (ImageView)findViewById(R.id.imageView1);
b1 = (Button)findViewById(R.id.button1);
b2 = (Button)findViewById(R.id.button2);
b3 = (Button)findViewById(R.id.button3);
et1 = (EditText)findViewById(R.id.editText1);
et2 = (EditText)findViewById(R.id.editText2);
adapter = new RegistrationAdapter(this);
iv.setImageDrawable(null); //Should be blank before selecting the image
}
public void browse(View v){
@SuppressWarnings("unused")
int id = v.getId();
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, REQUEST_CODE);
}
@SuppressWarnings("unused")
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK) {
Uri imgUri = data.getData();
logopath = getPath(imgUri);
//code to check on large image display
//start
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(logopath);
int imageHeight = options.outHeight;
int imageWidth = options.outWidth;
String imageType = options.outMimeType;
//iv.setImageBitmap(decodeSampledBitmapFromFile(logopath,125,125));
//end
ThumbImage = ThumbnailUtils.extractThumbnail(decodeSampledBitmapFromFile(logopath,125,125), 125, 125);
iv.setImageBitmap(ThumbImage);
}
}
//to display large image
//start
public static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) height / (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
public static Bitmap decodeSampledBitmapFromFile(String path, int reqWidth, int reqHeight)
{
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(path, options);
}
//end
private String getPath(Uri uri) {
String[] projection = {MediaStore.Images.Media.DATA};
@SuppressWarnings("deprecation")
Cursor cursor = managedQuery(uri, projection, null, null, null);
int col_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(col_index);
}
private String imgFilePath() {
File imgFile = null;
try {
imgFile = File.createTempFile("complogo", ".png");
} catch (IOException e) {
e.printStackTrace();
}
FileOutputStream fOut = null;
try {
fOut = new FileOutputStream(imgFile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
ThumbImage.compress(Bitmap.CompressFormat.PNG, 100, fOut);
imgPath = imgFile.getAbsolutePath();
return imgPath;
}
public void reset(View v){
et1.setText("");
et2.setText("");
iv.setImageDrawable(null); //Image is removed when reset
}
}
以及LogCat产生的错误 -
06-27 16:03:34.380: E/AndroidRuntime(4029): FATAL EXCEPTION: main
06-27 16:03:34.380: E/AndroidRuntime(4029): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { typ=image/jpeg }} to activity {com.example.tg_db1/com.example.tg_db1.add_company}: java.lang.NullPointerException
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.app.ActivityThread.deliverResults(ActivityThread.java:3103)
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3146)
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.app.ActivityThread.access$1100(ActivityThread.java:126)
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202)
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.os.Handler.dispatchMessage(Handler.java:99)
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.os.Looper.loop(Looper.java:137)
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.app.ActivityThread.main(ActivityThread.java:4586)
06-27 16:03:34.380: E/AndroidRuntime(4029): at java.lang.reflect.Method.invokeNative(Native Method)
06-27 16:03:34.380: E/AndroidRuntime(4029): at java.lang.reflect.Method.invoke(Method.java:511)
06-27 16:03:34.380: E/AndroidRuntime(4029): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-27 16:03:34.380: E/AndroidRuntime(4029): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-27 16:03:34.380: E/AndroidRuntime(4029): at dalvik.system.NativeStart.main(Native Method)
06-27 16:03:34.380: E/AndroidRuntime(4029): Caused by: java.lang.NullPointerException
06-27 16:03:34.380: E/AndroidRuntime(4029): at com.example.tg_db1.add_company.getPath(add_company.java:144)
06-27 16:03:34.380: E/AndroidRuntime(4029): at com.example.tg_db1.add_company.onActivityResult(add_company.java:79)
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.app.ActivityThread.deliverResults(ActivityThread.java:3099)
06-27 16:03:34.380: E/AndroidRuntime(4029): at android.app.Activity.dispatchActivityResult(Activity.java:4839)
06-27 16:03:34.380: E/AndroidRuntime(4029): ... 11 more
06-27 16:13:19.045: E/AndroidRuntime(4537): FATAL EXCEPTION: main
06-27 16:13:19.045: E/AndroidRuntime(4537): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { }} to activity {com.example.tg_db1/com.example.tg_db1.add_company}: java.lang.NullPointerException
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.app.ActivityThread.deliverResults(ActivityThread.java:3103)
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3146)
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.app.ActivityThread.access$1100(ActivityThread.java:126)
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202)
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.os.Handler.dispatchMessage(Handler.java:99)
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.os.Looper.loop(Looper.java:137)
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.app.ActivityThread.main(ActivityThread.java:4586)
06-27 16:13:19.045: E/AndroidRuntime(4537): at java.lang.reflect.Method.invokeNative(Native Method)
06-27 16:13:19.045: E/AndroidRuntime(4537): at java.lang.reflect.Method.invoke(Method.java:511)
06-27 16:13:19.045: E/AndroidRuntime(4537): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-27 16:13:19.045: E/AndroidRuntime(4537): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-27 16:13:19.045: E/AndroidRuntime(4537): at dalvik.system.NativeStart.main(Native Method)
06-27 16:13:19.045: E/AndroidRuntime(4537): Caused by: java.lang.NullPointerException
06-27 16:13:19.045: E/AndroidRuntime(4537): at com.example.tg_db1.add_company.getPath(add_company.java:145)
06-27 16:13:19.045: E/AndroidRuntime(4537): at com.example.tg_db1.add_company.onActivityResult(add_company.java:80)
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.app.Activity.dispatchActivityResult(Activity.java:4839)
06-27 16:13:19.045: E/AndroidRuntime(4537): at android.app.ActivityThread.deliverResults(ActivityThread.java:3099)
06-27 16:13:19.045: E/AndroidRuntime(4537): ... 11 more
请帮忙。提前谢谢。
答案 0 :(得分：2)
请尝试其他代码并应用您的项目..
请参阅此链接reduce image size
另一个链接.. this
请使用此代码..
private void TakeGalleryImage() {
Intent i = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK
&& null != data) {
Uri selectedImage = data.getData();
String mFileName= getRealPathFromURI(selectedImage);
SetImage(mFileName);
}
}
public String getRealPathFromURI(Uri contentUri) {
String[] proj = { MediaStore.Images.Media.DATA };
CursorLoader loader = new CursorLoader(UploadImageActivity.this, contentUri,
proj, null, null, null);
Cursor cursor = loader.loadInBackground();
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String mFileName = cursor.getString(column_index);
return mFileName;
}
在imageview中设置Bitmap
private void SetImage(String filename){
if (!filename.equals("")) {
File imgFile = new File(filename);
if(imgFile.exists()){
Bitmap myBitmap = ShrinkBitmap(filename, 125, 125);
mImgUploadImage.setImageBitmap(myBitmap);
flag=true;
}
}
}
此处为缩小图片代码
private Bitmap ShrinkBitmap(String file, int width, int height){
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
bmpFactoryOptions.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);
int heightRatio = (int)Math.ceil(bmpFactoryOptions.outHeight/(float)height);
int widthRatio = (int)Math.ceil(bmpFactoryOptions.outWidth/(float)width);
if (heightRatio > 1 || widthRatio > 1)
{
if (heightRatio > widthRatio)
{
bmpFactoryOptions.inSampleSize = heightRatio;
} else {
bmpFactoryOptions.inSampleSize = widthRatio;
}
}
bmpFactoryOptions.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);
return bitmap;
}
答案 1 :(得分：0)
Uri imgUri = data.getData();
我认为你在这一行得到了空。检查imgUri是否为null。喜欢
if(imgUri==null){
Log.d("Uri","uri is null");
}
某些设备为imgUri提供null我不知道为什么？