Android手机开发:ImageView使用和从内存读取图片显示
Android手机开发:ImageView使用和从内存读取图片显示
Android手机开发:ImageView使用和从内存读取图片显示源码:
- import java.io.File;
- import android.app.Activity;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.Button;
- import android.widget.ImageView;
- import android.widget.TextView;
- public class ImageViewActivity extends Activity {
- private Button myButtonSwitchImg;
- private ImageView myImageView;
- private TextView myTextView;
- private String filename = "/data/data/img.bmp";
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setTitle("ImageView");
- setContentView(R.layout.imageview);
- myButtonSwitchImg = (Button) findViewById(R.id.imgButton);
- myImageView = (ImageView) findViewById(R.id.imageView);
- myTextView = (TextView) findViewById(R.id.imgText);
- myButtonSwitchImg.setOnClickListener(new Button.OnClickListener() {
- @Override
- public void onClick(View v) {
- File file = new File(filename);
- if(file.exists()) {
- Bitmap bm = BitmapFactory.decodeFile(filename);
- myImageView.setImageBitmap(bm);
- myTextView.setText(filename);
- } else {
- myTextView.setText("File Not Found!");
- }
- }
- });
- }
- }
对应的XML文件如下:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical" android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- <TextView
- android:id="@+id/imgText"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="图片展示:" />
- <ImageView
- android:id="@+id/imageView"
- android:src="@drawable/imgqr"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"/>
- <Button
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="Switch"
- android:id="@+id/imgButton"
- android:layout_gravity="center_horizontal">
- </Button>
- </LinearLayout>
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