Android实现打开系统照相机&相册图片展示

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Android实现打开系统照相机&相册图片展示

Android系统本身提供了非常多的多媒体应用的API可供开发人员使用开发功能多彩多样的app，那么，因为之前自己完成的一个小小的app里面刚好我就用到了“打开系统照相机和打开相册”这两个部分的功能然后完成一个“图片空间”的这样一个子模块的功能。然后我接下来就会把我的代码给出来，然后大致上介绍一下怎样实现具体的功能。

1.主要功能java代码

（1）打开系统照相机

private Button btn_takephoto；btn_takephoto = (Button) findViewById(R.id.btn_takephoto);btn_takephoto.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent();intent.setAction("android.media.action.IMAGE_CAPTURE");intent.addCategory("android.intent.category.DEFAULT");startActivity(intent);}});

（2）打开相册及展示

private Button  btn_choosephoto；private ImageView img;btn_choosephoto.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, 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[] filePathColumn = { MediaStore.Images.Media.DATA };    Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);    cursor.moveToFirst();    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);    String picturePath = cursor.getString(columnIndex);    cursor.close();    img.setImageBitmap(BitmapFactory.decodeFile(picturePath));   }}

2.完整java代码

import com.example.mynote.R;import android.annotation.SuppressLint;import android.app.Activity;import android.content.Intent;import android.database.Cursor;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Bundle;import android.provider.MediaStore;import android.support.v4.content.ContextCompat;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;public class PhotoActivity extends Activity {protected static final int RESULT_LOAD_IMAGE = 0;private Button btn_takephoto, btn_choosephoto, photo_back;private ImageView img;@SuppressLint("ServiceCast")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_shake);btn_takephoto = (Button) findViewById(R.id.btn_takephoto);btn_choosephoto = (Button) findViewById(R.id.btn_choosephoto);photo_back = (Button) findViewById(R.id.photo_back);img = (ImageView) findViewById(R.id.img);// 返回键设置点击事件photo_back.setOnTouchListener((new View.OnTouchListener() {@SuppressLint("ClickableViewAccessibility")@Overridepublic boolean onTouch(View view, MotionEvent ev) {// TODO Auto-generated method stubint action = ev.getAction();switch (action) {case MotionEvent.ACTION_DOWN:photo_back.setBackground(ContextCompat.getDrawable(getApplicationContext(), R.drawable.back_click));break;case MotionEvent.ACTION_UP:photo_back.setBackground(ContextCompat.getDrawable(getApplicationContext(), R.drawable.back));Intent intent = new Intent(getApplicationContext(), ChooseActivity.class);startActivity(intent);}return false;}}));btn_takephoto.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent();intent.setAction("android.media.action.IMAGE_CAPTURE");intent.addCategory("android.intent.category.DEFAULT");startActivity(intent);}});btn_choosephoto.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent 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[] filePathColumn = { MediaStore.Images.Media.DATA };Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);cursor.moveToFirst();int columnIndex = cursor.getColumnIndex(filePathColumn[0]);String picturePath = cursor.getString(columnIndex);cursor.close();img.setImageBitmap(BitmapFactory.decodeFile(picturePath));}}}

3.布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="${relativePackage}.${activityClass}" >    <RelativeLayout        android:id="@+id/rl"        android:layout_width="match_parent"        android:layout_height="55dp"        android:background="#ff0000" >        <Button            android:id="@+id/photo_back"            android:layout_width="45dp"            android:layout_height="45dp"            android:layout_marginTop="5dp"            android:background="@drawable/back" >        </Button>        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerHorizontal="true"            android:layout_centerVertical="true"            android:text="我的图片空间"            android:textColor="#ffffff"            android:textSize="25sp" />    </RelativeLayout>        <View        android:id="@+id/top1"        android:layout_width="match_parent"        android:layout_height="2dp"        android:background="#ff0000"        android:layout_below="@+id/rl"        android:layout_marginTop="25dp"></View>        <View        android:id="@+id/top2"        android:layout_width="match_parent"        android:layout_height="2dp"        android:background="#ff0000"        android:layout_below="@+id/img"        android:layout_marginTop="20dp"></View>    <View        android:id="@+id/left"        android:layout_width="2dp"        android:layout_height="match_parent"        android:background="#ff0000"        android:layout_toLeftOf="@+id/btn_takephoto"        android:layout_marginLeft="5dp"        android:layout_marginTop="25dp"></View>        <View        android:id="@+id/right"        android:layout_width="2dp"        android:layout_height="match_parent"        android:background="#ff0000"        android:layout_toRightOf="@+id/btn_takephoto"        android:layout_marginTop="20dp"></View>    <View        android:id="@+id/bottom1"        android:layout_width="match_parent"        android:layout_height="2dp"        android:background="#ff0000"        android:layout_below="@+id/img"        android:layout_marginTop="25dp"></View>        <View        android:id="@+id/bottom2"        android:layout_width="match_parent"        android:layout_height="2dp"        android:background="#ff0000"        android:layout_below="@+id/rl"        android:layout_marginTop="20dp"></View>    <Button        android:id="@+id/btn_takephoto"        android:layout_width="300dp"        android:layout_height="wrap_content"        android:layout_below="@+id/rl"        android:layout_marginTop="50dp"        android:background="#ff0000"        android:text="打开照相机"        android:layout_centerHorizontal="true"        android:textColor="#ffffff"        android:textSize="20sp" >    </Button>    <Button        android:id="@+id/btn_choosephoto"        android:layout_width="300dp"        android:layout_height="wrap_content"        android:layout_below="@+id/btn_takephoto"        android:layout_marginTop="15dp"        android:layout_centerHorizontal="true"        android:background="#ff0000"        android:text="从相册中选择照片"        android:textColor="#ffffff"        android:textSize="20sp" >    </Button>    <ImageView        android:id="@+id/img"        android:layout_width="match_parent"        android:layout_height="340dp"        android:layout_below="@+id/btn_choosephoto"        android:layout_marginLeft="15dp"        android:layout_marginRight="15dp"        android:layout_marginTop="15dp"        android:background="@drawable/img" >    </ImageView></RelativeLayout>

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