Android 取得裁剪後的圖片, File, Intent, Intent.ACTION_GET_CONTENT, startActivityForResult, setImageDrawable

getpicture.xml

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="取得裁剪後的圖片"
        android:id="@+id/myButton" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/myImage" />
</LinearLayout>

GetPictureDemo.java

package com.example.administrator.test;

import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;

/**
 * Created by Administrator on 2014/10/10.
 */
public class GetPictureDemo extends Activity {
    private Button mButton;
    private ImageView mImageView;
    private File tempFile;      //用來臨時存放裁剪後的圖片

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.getpicture);

        mButton = (Button) findViewById(R.id.myButton);
        mImageView = (ImageView) findViewById(R.id.myImage);
        tempFile = new File("/sdcard/a.jpg");       //這句一定要宣告在onCreate()裡面

        mButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.setType("image/*");                      //開啟Pictures畫面Type設定為image
                intent.setAction(Intent.ACTION_GET_CONTENT);    //使用Intent.ACTION_GET_CONTENT
                intent.putExtra("crop", "true");                //crop = true, 才會出現裁剪

                /* aspectX, aspectY, 為裁剪框的比例, x:y = 1:1 */
                intent.putExtra("aspectX", 1);
                intent.putExtra("aspectY", 1);

                intent.putExtra("output", Uri.fromFile(tempFile));

                /* 取得圖片後, 返回 */
                startActivityForResult(intent.createChooser(intent, "選擇圖片"), 1);
            }
        });
    }

    /* 取得相片後返回的監聽 */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        /* 當使用者按下確定後 */
        if (resultCode == RESULT_OK) {
            mImageView.setImageDrawable(Drawable.createFromPath(tempFile.getAbsolutePath()));
        }

        super.onActivityResult(requestCode, resultCode, data);
    }
}