点击跳转到系统图库，然后将选择回来的图片显示到应用上

/**点击跳转到系统图库，然后将选择回来的图片显示到应用上*/
public class MainActivity extends Activity {
    
    private ImageView iv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iv = (ImageView) findViewById(R.id.iv);
    }
    //点击跳转按钮
    public void click(View v){
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_PICK);
        intent.setType("image/*");
        startActivityForResult(intent, 2);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==2){
            if(data!=null){//防止用户不选图片，回来时软件崩溃
                Uri uri = data.getData();
                iv.setImageURI(uri);
            }
        }
    }
}