android 工程，点击图片，在屏幕显示

1：首先创建一个android 工程名字自定义（此处为MyTest)2:替换MainActivity.java 代码如下package com.example.mytest;import android.net.Uri;import android.os.Bundle;import android.provider.MediaStore;import android.app.Activity;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener{    Button mButton;    ImageView mImageView;    TextView mTextView;    Bitmap bm;    private static final int REQUEST_CODE_SELECT_PIC = 120;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //注册三个组件        mButton = (Button) findViewById(R.id.button1);        mImageView = (ImageView) findViewById(R.id.imageView1);        mTextView = (TextView) findViewById(R.id.textView1);        mButton.setOnClickListener(this);    }    @Override    public void onClick(View arg0) {        // TODO Auto-generated method stub        if(arg0.getId() == R.id.button1)        {            selectPicture();        }    }    private void selectPicture() {        Intent intent = new Intent();        intent.setAction(Intent.ACTION_PICK);        intent.setType("image/*");        // 这个函数会自动调用下面的函数        startActivityForResult(intent, REQUEST_CODE_SELECT_PIC);    }protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (requestCode == REQUEST_CODE_SELECT_PIC) {            // 获取选择的图片            Uri selectedImage = data.getData();            int width = 0;            int height = 0;            String[] filePathColumn = { MediaStore.Images.Media.DATA };            Cursor cursor = getContentResolver().query(selectedImage, null,                    null, null, null);            cursor.moveToFirst();            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);            // 获取到图片的路径            String selectedImagePath = cursor.getString(columnIndex);            Log.i("zhang selectedImagePath", selectedImagePath);            // 调取底层处理            //DealImage(selectedImagePath);            // 解码该路径的图片，得到bitmap 图片            bm = BitmapFactory.decodeFile(selectedImagePath);            width = bm.getWidth();            height = bm.getHeight();            if (selectedImage != null)             {                //将图片显示到ImageView中                mImageView.setImageBitmap(bm);            }        }        super.onActivityResult(requestCode, resultCode, data);    }}3： 替换res 下的layout 文件夹下面的 activity_main.xml ，代码如下"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" >    "@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:text="TextView" />    "@+id/imageView1"        android:layout_width="240dp"        android:layout_height="240dp"        android:layout_marginLeft="0dp"        android:layout_marginTop="0dp"        android:layout_x="116dp"        android:layout_y="26dp"        android:src="@drawable/ic_launcher" />
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