android活动中的图像浏览按钮

Image browse button in android activity(android活动中的图像浏览按钮)

问题描述

目前我正在开发一个需要在我的活动中使用浏览按钮的应用程序.当我按下浏览按钮时，我应该能够浏览我的 SD 卡以及手机内存中的图像文件.在点击图像文件时，它应该被选中并且图像文件的路径(即，所选图像文件所在的位置)应该显示在文本视图的活动中.所选图像也应显示在图像视图中.这个怎么做?谁能帮帮我..

currently I'm developing an application which requires a browse button in my activity. When I press the browse button I should be able to browse the image files in my sdcard as well as in the phone memory. Upon tapping the image file it should be selected and the path of the image file (that is, where that selected image file is located) should be displayed in the activity in a textview. Also the selected image should be displayed in a imageview. How to do this? Can someone please help me out..

推荐答案

main.xml

<?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">
    <ImageView
        android:id="@+id/imgView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"></ImageView>
    <Button
        android:id="@+id/buttonLoadPicture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0"
        android:text="Load Picture"
        android:layout_gravity="center"></Button>
</LinearLayout>

MainActivity.java

package com.example.yourpackage;

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.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {


    private static int RESULT_LOAD_IMAGE = 1;


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

        Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadPicture);
        buttonLoadImage.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {

                Intent i = new Intent(
                        Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                startActivityForResult(i, RESULT_LOAD_IMAGE);
            }
        });
    }


    @Override
    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();

            ImageView imageView = (ImageView) findViewById(R.id.imgView);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

        }


    }
}

在清单中添加权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

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