Android 相机拍照，解决拍照过小不清晰

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布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/LinearLayout1"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    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.takephoto.MainActivity" >    <Button        android:id="@+id/btn_openCamera"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="click"        android:text="openCamera" />    <ImageView        android:id="@+id/iv_photo"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:src="@drawable/ic_launcher" /></LinearLayout>

全部代码：

package com.example.takephoto;import java.io.File;import java.text.SimpleDateFormat;import java.util.Date;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;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.View;import android.widget.ImageView;public class MainActivity extends ActionBarActivity {    private String photo_name;    private ImageView mImageView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mImageView = (ImageView)findViewById(R.id.iv_photo);    }    public void click(View view) {        switch (view.getId()) {            case R.id.btn_openCamera:                String currentTime = getCurrentTime();                photo_name = currentTime + ".jpg";                if (isSDAvaiable()) {                    Log.i("click", "sd可用");                    Log.i("click", "开启相机");                    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);                    intent.putExtra(                            MediaStore.EXTRA_OUTPUT,                            Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/"                                    + photo_name)));                    startActivityForResult(intent, 1);                } else {                    Log.i("click", "sd不可用");                }                break;            default:                break;        }    }    @Override    protected void onActivityResult(int arg0, int arg1, Intent arg2) {        if (arg0 == 1) {            Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()                    + "/" + photo_name);            Bitmap resizeBitmap = resizeBitmap(bitmap, 640);            mImageView.setImageBitmap(resizeBitmap);        }        super.onActivityResult(arg0, arg1, arg2);    }    private boolean isSDAvaiable() {        String externalStorageState = Environment.getExternalStorageState();        if (externalStorageState.equals(Environment.MEDIA_MOUNTED)) {            return true;        } else {            return false;        }    }    public static Bitmap resizeBitmap(Bitmap bitmap, int newWidth) {        int width = bitmap.getWidth();        int height = bitmap.getHeight();        float temp = ((float)height) / ((float)width);        int newHeight = (int)((newWidth) * temp);        float scaleWidth = ((float)newWidth) / width;        float scaleHeight = ((float)newHeight) / height;        Matrix matrix = new Matrix();        // resize the bit map        matrix.postScale(scaleWidth, scaleHeight);        // matrix.postRotate(45);        Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);        bitmap.recycle();        return resizedBitmap;    }    private String getCurrentTime() {        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss ");        Date curDate = new Date(System.currentTimeMillis());        String timeString = simpleDateFormat.format(curDate);        return timeString;    }}

demo:
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