第二章:java I/O應用

效果：


[img]http://dl.iteye.com/upload/attachment/388549/e8633f32-ec26-301d-a307-5310dfc73e11.jpg[/img]


main。xml

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget0"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>

<EditText
android:id="@+id/text"
android:layout_width="194px"
android:layout_height="wrap_content"
android:textSize="18sp"
android:layout_x="103px"
android:layout_y="23px"
>
</EditText>
<TextView
android:id="@+id/widget36"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="輸入搜索內容:"
android:layout_x="5px"
android:layout_y="34px"
>
</TextView>
<Button
android:id="@+id/search"
android:layout_width="157px"
android:layout_height="wrap_content"
android:text="搜素"
android:layout_x="118px"
android:layout_y="86px"
>
</Button>
<TextView
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="16px"
android:layout_y="189px"
>
</TextView>

</AbsoluteLayout>

package i.o.test;

import java.io.File;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class IOTest extends Activity {
    /** Called when the activity is first created. */
	private Button bt;
	private EditText text;
	private TextView message;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        bt=(Button)findViewById(R.id.search);
        text=(EditText)findViewById(R.id.text);
        message=(TextView)findViewById(R.id.message);
        bt.setOnClickListener(new Button.OnClickListener(){
        	public void onClick(View v){
        		String str=text.getText().toString();
        		if(str.equals("")){
        			message.setText("輸入內容不能爲空！");
        		}else{
        			message.setText(searchFile(str));
        		}
        	}
        });
    }

    public String searchFile(String str){
    	String result="";
    	File[] fils=new File("/").listFiles();
    	for(File f:fils){
    		if(f.getName().indexOf(str)>=0){
    			result=result+f.getPath()+"\n";
    		}
    	}
    	if(result.equals("")){
    		result="沒有該文件！";
    	}
		return result;
    }
}