<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" >  <ImageView   android:id="@+id/image_choose"   android:layout_width="250dp"   android:layout_height="250dp"   android:background="#CC0000"   android:layout_centerHorizontal="true"   android:layout_marginTop="30dp"   android:src="@drawable/default_bg"   android:padding="5dp"   /> </RelativeLayout> 

package com.example.chooseimage; import android.os.Bundle; import android.provider.MediaStore; import android.app.Activity; import android.content.Intent; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.ImageView; public class MainActivity extends Activity implements OnClickListener {  private ImageView image_choose;  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   requestWindowFeature(Window.FEATURE_NO_TITLE);   setContentView(R.layout.activity_main);   image_choose = (ImageView) findViewById(R.id.image_choose);   image_choose.setOnClickListener(this);  }  @Override  public void onClick(View v) {   // TODO Auto-generated method stub   switch (v.getId()) {   case R.id.image_choose: {    Intent intent = new Intent(Intent.ACTION_PICK, null);    intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,      "image/*");    startActivityForResult(intent, 0x1);    break;   }   }  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {   // TODO Auto-generated method stub   if (requestCode == 0x1 && resultCode == RESULT_OK) {    if (data != null) {     image_choose.setImageURI(data.getData());    }   }   super.onActivityResult(requestCode, resultCode, data);  } }