android 使用系统照相程序照相并存储、显示在界面上

大部分业务可以通过调用系统的相机程序来拍照。

界面如下：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

              android:orientation="vertical"

              android:layout_width="fill_parent"

              android:layout_height="fill_parent"

        >

    <Button

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:text="前往拍照"

            android:onClick="goToPicture"

            />

    <ImageView

            android:id="@+id/imageView"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            />

</LinearLayout>

java：

package com.example.usingSystemCamera;

import android.app.Activity;

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.view.View;

import android.widget.ImageView;

import java.io.File;

public class MyActivity extends Activity {

    private File file;//相片文件

    private ImageView imageView;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        imageView = (ImageView) findViewById(R.id.imageView);

    }

    public void goToPicture(View view) {

        Intent intent = new Intent();

        intent.setAction("android.media.action.IMAGE_CAPTURE");

        intent.addCategory("android.intent.category.DEFAULT");

        file = new File(Environment.getExternalStorageDirectory(), "myJpg.jpg");

        Uri uri = Uri.fromFile(file);

        intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);

        startActivityForResult(intent, 0);

    }

    /**

     * 当保存了文件后，设置到界面上

     */

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        Bitmap bitmap = BitmapFactory.decodeFile(file.getPath(), null);

        imageView.setImageBitmap(bitmap);

    }

}