我试图制作一个Android应用程序,它将从相机拍摄照片并将其显示在"拍照按钮"旁边的同一屏幕上。我一直在尝试使用教程,但它无法正常工作。每当我拍照并按保存时,图片应用程序都会失败。此外,如果我保存了照片,我也不知道它是否会在屏幕上显示照片。但是,我不确定这一点,因为在我按下保存后它总是会中断。 有没有人有任何建议可以帮我保存并在屏幕上显示照片? 感谢
这是我的xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
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="com.example.pictureproject.MainActivity"
android:orientation ="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/button_camera"
android:text="@string/button_camera"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<ImageView
android:id = "@+id/image_camera"
android:contentDescription="@string/image_cd_camera"
android:layout_width="fill_parent"
android:layout_height = "wrap_content"
/>
</LinearLayout>
和Heres我的java:
package com.example.pictureproject;
import java.io.File;
import android.app.Activity;
import android.content.ContentResolver;
import android.view.View.OnClickListener;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
private static String logtag ="CameraApp8";
private static int TAKE_PICTURE = 1;
private Uri imageUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button cameraButton = (Button)findViewById(R.id.button_camera);/*possibly button camera 1*/
cameraButton.setOnClickListener(cameraListener);
}
private OnClickListener cameraListener = new OnClickListener() {
public void onClick(View v){
takePhoto(v);
}
};
private void takePhoto(View v){
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
File photo = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"picture.jpg");
imageUri = Uri.fromFile(photo);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, TAKE_PICTURE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent){
super.onActivityResult(requestCode, resultCode, intent);
if(resultCode == Activity.RESULT_OK){
Uri selectedImage = imageUri;
getContentResolver().notifyChange(selectedImage, null);
ImageView imageView = (ImageView)findViewById(R.id.image_camera);
ContentResolver cr = getContentResolver();
Bitmap bitmap;
try{
bitmap = MediaStore.Images.Media.getBitmap(cr,selectedImage);
imageView.setImageBitmap(bitmap);
Toast.makeText(MainActivity.this, selectedImage.toString(),Toast.LENGTH_LONG).show();
}catch(Exception e){
Log.e(logtag,e.toString());
}
}
}
@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);
}
}
答案 0 :(得分:0)
尝试添加此代码..
public class MyCameraActivity extends Activity {
private static final int CAMERA_REQUEST = 1888;
private ImageView imageView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.imageView = (ImageView)this.findViewById(R.id.imageView1);
Button photoButton = (Button) this.findViewById(R.id.button1);
photoButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(photo);
}
}
}