Android入门之ImageView(纯Java)
Android入门之ImageView(纯Java)
- import Android.app.Activity;
- import android.graphics.*;
- import android.graphics.drawable.*;
- import android.os.Bundle;
- import android.widget.*;
- import android.widget.ImageView.ScaleType;
- public class ImageViewTest extends Activity {
- private LinearLayout mainLayout=null;
- private ImageView iv=null;
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- /*mainLayout初始化*/
- mainLayout=new LinearLayout(this);
- mainLayout.setLayoutParams(new LinearLayout.LayoutParams(-1,-1));
- /*iv初始化*/
- iv=new ImageView(this);
- iv.setLayoutParams(new LinearLayout.LayoutParams(-1,-2));
- iv.setScaleType(ScaleType.CENTER);//居中显示
- /*加载图片方法1*/
- //Drawable d=this.getResources().getDrawable(R.drawable.icon);//此处icon对应drawable文件夹下的icon.png
- //iv.setImageDrawable(d);//设置图片
- /*加载图片方法2*/
- int resId=this.getResources().getIdentifier("icon","drawable",getPackageName());
- iv.setImageResource(resId);
- /*加载图片方法3,在方法2的基础上生成Bitmap bm*/
- //int resId=this.getResources().getIdentifier("icon","drawable", getPackageName());
- //Bitmap bm = BitmapFactory.decodeResource(this.getResources(), resId);
- //iv.setImageBitmap(bm);
- mainLayout.addView(iv);//添加iv
- setContentView(mainLayout);//显示manLayout
- }
- }
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