Android从相册选择图片和调用系统摄像头拍照

Android开发中很多情况下需要从图册或者相机中获取到图片，

下面就分享一个小栗子。



效果为从相册或者拍照获得的图片然后设置给界面中的ImageView。

至于对话框的弹出方式这里就不赘述了，请自行参考：

Android实现QQ换头像的对话框

http://blog.csdn.net/u014112893/article/details/52801447

在最底下会给出APK和源码。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
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.dialogtest.MainActivity">

<Button
android:id="@+id/btn_show_dialog"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/show_dialog" />

<ImageView
android:id="@+id/img"
android:layout_width="300dp"
android:layout_height="300dp" />
</LinearLayout>

主界面中只有一个按钮和一个显示图片的控件。

此Demo采用了比较简单的MVP模式(Model-View-Presenter)，

在View中写抽象接口，然后主要在presenter中写逻辑事件，在这个

Demo中没用到模型Model。

public interface IHeaderView {
//用于图片获取成功设置给ImageView
void setHeaderBitmap(Bitmap bitmap);
}

点击按钮弹出选择对话框：

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_show_dialog:
headerPresenter.showHeadDialog();
break;
}
}

HeaderPresenter：

package mvp.presenter;

import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
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.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;

import com.hcc.selectphototest.R;

import java.io.File;

import mvp.view.IHeaderView;

/**
* Created by ${hcc} on 2016/10/17.
*/
public class HeaderPresenter {
private IHeaderView iHeaderView;
private Context context;

public HeaderPresenter(IHeaderView iHeaderView, Context context) {
this.iHeaderView = iHeaderView;
this.context = context;
}

/*设置并显示Dialog*/
public void showHeadDialog() {
View view = LayoutInflater.from(context).inflate(R.layout.head_dialog, null);
final Dialog dialog = new Dialog(context, R.style.transparentFrameWindowStyle);
dialog.setContentView(view, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
Window window = dialog.getWindow();
window.setWindowAnimations(R.style.anim_style);
WindowManager.LayoutParams layoutParams = window.getAttributes();
layoutParams.x = 0;
layoutParams.y = ((Activity) context).getWindowManager().getDefaultDisplay().getHeight();
layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT; //保证dialog窗体可以水平铺满
layoutParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;

dialog.onWindowAttributesChanged(layoutParams);//设置dialog的摆放位置
dialog.setCanceledOnTouchOutside(true);//设置点击dialog以为的区域dialog消失
dialog.show();

/*相册选择*/      dialog.findViewById(R.id.tv_select_photo).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
selectFromAlbum();
if (dialog.isShowing()) {
dialog.dismiss();
}
}
});

/*拍照*/     dialog.findViewById(R.id.tv_take_photo).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
takePhoto();
if (dialog.isShowing()) {
dialog.dismiss();
}
}
});

dialog.findViewById(R.id.tv_cancel).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
}

//从相册获取
private void selectFromAlbum() {
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
((Activity) context).startActivityForResult(intent, 2);
}

//拍照
private void takePhoto() {
String state = Environment.getExternalStorageState();
/*判断是否有SD卡*/
if (state.equals(Environment.MEDIA_MOUNTED)) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(
new File(Environment.getExternalStorageDirectory(), "iMon.jpg")));
((Activity) context).startActivityForResult(intent, 3);
} else {
Toast.makeText(context, "内存卡不存在", Toast.LENGTH_LONG).show();
}
}

//裁剪图片
public void startPhotoZoom(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
//下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪
intent.putExtra("crop", "true");
// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// outputX outputY 是裁剪图片宽高
intent.putExtra("outputX", 150);
intent.putExtra("outputY", 150);
intent.putExtra("return-data", true);
if (context instanceof Activity) {
((Activity) context).startActivityForResult(intent, 4);
}
}

//设置给视图
public void setView(Intent date) {
Bundle bundle = date.getExtras();
Bitmap bitmap = bundle.getParcelable("data");
iHeaderView.setHeaderBitmap(bitmap);
}
}

从图册、拍照和裁剪分别有一个请求码，然后主要从MainActivity

中接收，重写onActivityResult，根据不同的请求码做出不同的响

应。

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// 点击取消按钮
if (resultCode == RESULT_CANCELED) {
return;
}

switch (requestCode) {
case 2:
Uri uri = data.getData();
headerPresenter.startPhotoZoom(uri);
break;
case 3:
File file = new File(Environment.getExternalStorageDirectory() + "/" + "iMon.jpg");
headerPresenter.startPhotoZoom(Uri.fromFile(file));
break;
case 4:
if (data != null) {
headerPresenter.setView(data);
}
break;
}
}

case 4代表剪裁完成，剪裁完成后将Intent类型的date传给setView,

然后获取到bitmap对象设置给ImageView控件。

public void setView(Intent date) {
Bundle bundle = date.getExtras();
Bitmap bitmap = bundle.getParcelable("data");
iHeaderView.setHeaderBitmap(bitmap);
}

@Override
public void setHeaderBitmap(Bitmap bitmap) {
img.setImageBitmap(bitmap);
}

这样就能实现从相册和相机中获取图片了。

安装包在源码根目录，传送>>>