我在MainActivity上有两个按钮。一个用于从Gallery中选择图像，另一个用于相机图像捕获。我想将这些图像发送到第二个活动。当我尝试使用Gallery图像时，我获得了成功。但是，现在我想将捕获的图像传递给第二个活动。我尝试了很多代码但却无法得到满意的结果。
以下是我的代码......
MainActivity.java
package com.MyFirstApp.myfirstapp;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
Button btn_choose_from_gallery, btn_go_to_camera;
int REQUEST_GALLERY = 1;
int REQUEST_CAMERA = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_choose_from_gallery = (Button) findViewById(R.id.btn_choose_from_gallery);
btn_go_to_camera = (Button) findViewById(R.id.btn_go_to_camera);
btn_choose_from_gallery.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, REQUEST_GALLERY);
}
});
btn_go_to_camera.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent_camera = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent_camera, REQUEST_CAMERA);
}
});
}
/* Choose Image from Gallery & Camera onActivityResult */
@Override
protected void onActivityResult(int reqCode, int resCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(reqCode, resCode, data);
if (resCode == RESULT_OK) {
if (reqCode == REQUEST_CAMERA) {
if (data != null) {
Uri CapturedImgUri = data.getData();
/* Passing ImageURI to the Second Activity */
Intent IntentCamera = new Intent(this, Second.class);
IntentCamera.putExtra("CapturedImgUri", CapturedImgUri);
startActivity(IntentCamera);
}
} else if (reqCode == REQUEST_GALLERY) {
if (data != null) {
Uri selectedImgUri = data.getData();
/* Passing ImageURI to the Second Activity */
Intent IntentGallery = new Intent(this, Second.class);
IntentGallery.setData(selectedImgUri);
startActivity(IntentGallery);
}
}
}
}
/* Choose Image from Gallery onActivityResult */// This code works fine when
// I just want to choose
// image only from Gallery//
// @Override
// protected void onActivityResult(int reqCode, int resCode, Intent data) {
// // TODO Auto-generated method stub
// super.onActivityResult(reqCode, resCode, data);
//
// if (reqCode == REQUEST_GALLERY && resCode == RESULT_OK && data != null) {
// Uri selectedImgUri = data.getData();
//
// /* Passing ImageURI to the Second Activity */
// Intent img_pass = new Intent(this, Second.class);
// img_pass.setData(selectedImgUri);
// startActivity(img_pass);
// }
// }
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Second.java
package com.MyFirstApp.myfirstapp;
import android.app.Activity;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import com.devsmart.android.ui.HorizontalListView;
public class Second extends Activity {
TouchImageView img_to_be_zoomed, img_to_be_zoomed_second;
ImageView img_back;
HorizontalListView HListView, HListViewFirst;
Bitmap bitmap_img;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
img_to_be_zoomed = (TouchImageView) findViewById(R.id.img_to_be_zoomed);
img_to_be_zoomed_second = (TouchImageView) findViewById(R.id.img_to_be_zoomed_second);
img_back = (ImageView) findViewById(R.id.img_back_icon);
HListView = (HorizontalListView) findViewById(R.id.horizontal_list_view);
HListViewFirst = (HorizontalListView) findViewById(R.id.horizontal_list_view_first);
/* Top Back Icon */
img_back.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
/* Left Image Touch Event */
img_to_be_zoomed
.setOnTouchImageViewListener(new com.MyFirstApp.myfirstapp.TouchImageView.OnTouchImageViewListener() {
@Override
public void onMove() {
img_to_be_zoomed_second.setZoom(img_to_be_zoomed);
PointF pointF_img1 = new PointF();
pointF_img1 = img_to_be_zoomed.getScrollPosition();
img_to_be_zoomed_second.setScrollPosition(
1 - pointF_img1.x, pointF_img1.y);
}
});
/* Right Image touch event */
img_to_be_zoomed_second
.setOnTouchImageViewListener(new com.MyFirstApp.myfirstapp.TouchImageView.OnTouchImageViewListener() {
@Override
public void onMove() {
img_to_be_zoomed.setZoom(img_to_be_zoomed_second);
PointF pointF_img1 = new PointF();
pointF_img1 = img_to_be_zoomed_second
.getScrollPosition();
img_to_be_zoomed.setScrollPosition(1 - pointF_img1.x,
pointF_img1.y);
}
});
int[] HorizontalListImages = new int[] { R.drawable.icon_grid,
R.drawable.icon_text, R.drawable.icon_clip_art };
final int[] HorizontalListImagesFirst = new int[] {
R.drawable.icon_go_back, R.drawable.icon_horizontal_grid,
R.drawable.icon_vertical_grid };
/* Animation References */
final Animation slideUp = AnimationUtils.loadAnimation(
getApplicationContext(), R.anim.slide_up);
final Animation slideDown = AnimationUtils.loadAnimation(
getApplicationContext(), R.anim.slide_down);
/* Setting Adapter for Horizontal List Views */
HorizontalListViewAdapter horizontalListViewAdapter = new HorizontalListViewAdapter(
Second.this, HorizontalListImages);
HListView.setAdapter(horizontalListViewAdapter);
/* Horizontal List View Item Click Listener */
HListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
switch (position) {
case 0:
HorizontalListViewAdapterFirst horizontalListViewAdapterFirst = new HorizontalListViewAdapterFirst(
Second.this, HorizontalListImagesFirst);
HListViewFirst.setAdapter(horizontalListViewAdapterFirst);
HListView.startAnimation(slideDown);
HListView.setVisibility(View.GONE);
HListViewFirst.startAnimation(slideUp);
HListViewFirst.setVisibility(View.VISIBLE);
break;
default:
break;
}
}
});
HListViewFirst.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
switch (position) {
case 0:
HListViewFirst.startAnimation(slideDown);
HListViewFirst.setVisibility(View.GONE);
HListView.startAnimation(slideUp);
HListView.setVisibility(View.VISIBLE);
break;
case 1:
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(
displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
/* Setting Center Layout For Both Images */
RelativeLayout.LayoutParams ImagelayoutParams = new RelativeLayout.LayoutParams(
width, width);
ImagelayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
((RelativeLayout) findViewById(R.id.imagelayout))
.setLayoutParams(ImagelayoutParams);
RelativeLayout.LayoutParams layoutParamsLeft = new RelativeLayout.LayoutParams(
width / 2, width);
layoutParamsLeft.setMargins(0, 0, 0, 0);
img_to_be_zoomed.setLayoutParams(layoutParamsLeft);
bitmap_img = ((BitmapDrawable) img_to_be_zoomed
.getDrawable()).getBitmap();
bitmap_img = flipImage(bitmap_img, 2);
img_to_be_zoomed_second.setImageBitmap(bitmap_img);
RelativeLayout.LayoutParams layoutParamsRight = new RelativeLayout.LayoutParams(
width / 2, width);
layoutParamsRight.setMargins(width / 2, 0, 0, 0);
img_to_be_zoomed_second.setLayoutParams(layoutParamsRight);
// img_to_be_zoomed.invalidate();
img_to_be_zoomed_second.setVisibility(view.VISIBLE);
break;
default:
break;
}
}
});
/* Getting ImageURI from Gallery from Main Activity */
Uri selectedImgUri = getIntent().getData();
String[] selectedImgPath = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImgUri,
selectedImgPath, null, null, null);
cursor.moveToFirst();
int indexCol = cursor.getColumnIndex(selectedImgPath[0]);
String imgPath = cursor.getString(indexCol);
cursor.close();
img_to_be_zoomed.setImageBitmap(BitmapFactory.decodeFile(imgPath));
/* Getting Image from Camera from Main Activity */
Uri CapturedImgUri = getIntent().getParcelableExtra("CapturedImgUri");
Log.e("URI", "" + CapturedImgUri);
img_to_be_zoomed.setImageURI(CapturedImgUri);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/* Flip Image Class */
public Bitmap flipImage(Bitmap src, int type) {
Matrix matrix = new Matrix();
/* Flip vertically */
if (type == 1) {
matrix.preScale(1.0f, -1.0f);
/* Flip horizontally */
} else if (type == 2) {
matrix.preScale(-1.0f, 1.0f);
} else {
return null;
}
return Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(),
matrix, true);
}
}
的Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.MyFirstApp.myfirstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="17" />
<!-- Required Permissions -->
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Second"
android:label="@string/title_activity_second" >
</activity>
</application>
</manifest>
我收到如下错误....
01-05 04:39:21.055: E/AndroidRuntime(7471): FATAL EXCEPTION: main
01-05 04:39:21.055: E/AndroidRuntime(7471): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MyFirstApp.myfirstapp/com.MyFirstApp.myfirstapp.Second}: java.lang.NullPointerException
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.app.ActivityThread.access$600(ActivityThread.java:123)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.os.Handler.dispatchMessage(Handler.java:99)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.os.Looper.loop(Looper.java:137)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.app.ActivityThread.main(ActivityThread.java:4424)
01-05 04:39:21.055: E/AndroidRuntime(7471): at java.lang.reflect.Method.invokeNative(Native Method)
01-05 04:39:21.055: E/AndroidRuntime(7471): at java.lang.reflect.Method.invoke(Method.java:511)
01-05 04:39:21.055: E/AndroidRuntime(7471): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-05 04:39:21.055: E/AndroidRuntime(7471): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-05 04:39:21.055: E/AndroidRuntime(7471): at dalvik.system.NativeStart.main(Native Method)
01-05 04:39:21.055: E/AndroidRuntime(7471): Caused by: java.lang.NullPointerException
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.content.ContentResolver.acquireProvider(ContentResolver.java:913)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.content.ContentResolver.query(ContentResolver.java:305)
01-05 04:39:21.055: E/AndroidRuntime(7471): at com.MyFirstApp.myfirstapp.Second.onCreate(Second.java:185)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.app.Activity.performCreate(Activity.java:4492)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
01-05 04:39:21.055: E/AndroidRuntime(7471): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
01-05 04:39:21.055: E/AndroidRuntime(7471): ... 11 more
提前致谢....
答案 0 :(得分：4)
我已经建立了解决方案，不是我想要的方式，但方式略有不同......
更改MainActivity.java的代码
/* Choose Image from Gallery & Camera onActivityResult */
@Override
protected void onActivityResult(int reqCode, int resCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(reqCode, resCode, data);
if (resCode == RESULT_OK) {
if (reqCode == REQUEST_CAMERA) {
if (data != null) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
/* Passing BITMAP to the Second Activity */
Intent IntentCamera = new Intent(this, Second.class);
IntentCamera.putExtra("BitmapImage", photo);
startActivity(IntentCamera);
}
} else if (reqCode == REQUEST_GALLERY) {
if (data != null) {
Uri selectedImgUri = data.getData();
/* Passing ImageURI to the Second Activity */
Intent IntentGallery = new Intent(this, Second.class);
IntentGallery.setData(selectedImgUri);
startActivity(IntentGallery);
}
}
}
}
更改Second.java的代码
/* Getting ImageURI from Gallery from Main Activity */
Uri selectedImgUri = getIntent().getData();
if (selectedImgUri != null) {
Log.e("Gallery ImageURI", "" + selectedImgUri);
String[] selectedImgPath = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImgUri,
selectedImgPath, null, null, null);
cursor.moveToFirst();
int indexCol = cursor.getColumnIndex(selectedImgPath[0]);
String imgPath = cursor.getString(indexCol);
cursor.close();
img_to_be_zoomed.setImageBitmap(BitmapFactory.decodeFile(imgPath));
}
/* Getting ImageBitmap from Camera from Main Activity */
Intent intent_camera = getIntent();
Bitmap camera_img_bitmap = (Bitmap) intent_camera
.getParcelableExtra("BitmapImage");
if (camera_img_bitmap != null) {
img_to_be_zoomed.setImageBitmap(camera_img_bitmap);
}
}
希望这能有所帮助......
答案 1 :(得分：0)
嘿，您使用Gallery Intent传递数据，并在Camera Intent中传递String。在第二个活动中，您将检索getIntent（）。getData（）。这是
替换此行
Uri CapturedImgUri = data.getData();
/* Passing ImageURI to the Second Activity */
Intent IntentCamera = new Intent(this, Second.class);
IntentCamera.putExtra("CapturedImgUri", CapturedImgUri);
startActivity(IntentCamera);
带
Uri CapturedImgUri = data.getData();
/* Passing ImageURI to the Second Activity */
Intent IntentCamera = new Intent(this, Second.class);
IntentCamera.putData("CapturedImgUri", CapturedImgUri);
startActivity(IntentCamera);
在onActivityResult方法的第一个活动中。
希望这会有效......