Android如何从图库获取一张图片并显示

主布局XML:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="fill_parent"

android:layout_height="fill_parent" >

<Button

android:id="@+id/mybtn"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:text="Press Me" />

<ImageView

android:id="@+id/myimage"

android:layout_width="200dip"

android:layout_height="200dip"

android:layout_below="@id/mybtn"

android:layout_centerHorizontal="true"

android:scaleType="centerInside" />

</RelativeLayout>

源码：

public class MainActivity extends Activity {

private Button myBtn = null;

private ImageView myImageView = null;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

myImageView = (ImageView)findViewById(R.id.myimage);

myBtn = (Button)findViewById(R.id.mybtn);

myBtn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Intent intent = new Intent();

// 打开Pictures画面Type为image/*

intent.setType("image/*");

intent.setAction(Intent.ACTION_GET_CONTENT);

startActivityForResult(intent, 1);

}

});

}

@Override

public void onActivityResult(int requestCode, int resultCode, Intent data) {

if (RESULT_OK == resultCode) {

Uri uri = data.getData();

ContentResolver cr = this.getContentResolver();

try {

Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));

myImageView.setImageBitmap(bitmap);

} catch (FileNotFoundException e) {

e.printStackTrace();

}

}

super.onActivityResult(requestCode, resultCode, data);

}

}

效果图：