Android练习之BitmapFactory.decodeFile加载SD卡文件

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 1 package com.example.flexd13; 2  3 import java.io.File; 4  5 import android.os.Bundle; 6 import android.app.Activity; 7 import android.graphics.Bitmap; 8 import android.graphics.BitmapFactory; 9 import android.view.Menu;10 import android.view.View;11 import android.view.View.OnClickListener;12 import android.widget.Button;13 import android.widget.ImageView;14 import android.widget.TextView;15 16 /**17  * 点击Button给ImageView赋值18  * 重点是从手机中找到图片，给Bitmap19  */20 public class MainActivity extends Activity {21     22     private TextView tv1;23     private ImageView iv1;24     private Button bt1;25     private String fileName = "com.example.flexd13/baidu.gif";26 27     @Override28     protected void onCreate(Bundle savedInstanceState) {29         super.onCreate(savedInstanceState);30         setContentView(R.layout.activity_main);31         32         tv1 = (TextView)findViewById(R.id.tv1);33         iv1 = (ImageView)findViewById(R.id.iv1);34         bt1 = (Button)findViewById(R.id.bt1);35         36         bt1.setOnClickListener(listener);37         38     }39     40     /**41      * Listener42      */43     View.OnClickListener listener = new OnClickListener() {44         45         @Override46         public void onClick(View v) {47             File file = new File(fileName);48             if(file.exists()){49                 //从文件生成Bitmap50                 Bitmap bitmap = BitmapFactory.decodeFile(fileName);51                 iv1.setImageBitmap(bitmap);52                 tv1.setText(fileName);53             }else{54                 tv1.setText("ERROR file not found");55             }56         }57     };58 59     @Override60     public boolean onCreateOptionsMenu(Menu menu) {61         // Inflate the menu; this adds items to the action bar if it is present.62         getMenuInflater().inflate(R.menu.activity_main, menu);63         return true;64     }65 66 }

转载于:https://www.cnblogs.com/imzzh/archive/2013/01/09/2852951.html

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