1. 界面設計:
簡單以搜索根目錄下的文件爲例。輸入一段字符串,搜索包含該字符串的文件或文件夾。
整個APP只涉及到三個控件:
(1)EditText:輸入想查找的內容;
(2)Button:觸發查找;
(3)TextView:顯示查找結果,因爲結果可能很長,所以TextView要設置爲可滾動的,設置的辦法分兩步,具體如下:
設置佈局文件中TextView的屬性:
1 2 3 4 5 6 7 8 9 10 11 | <!-- 設置scrollbars和singleLine的屬性,以實現TextView可滾動。 -->
< TextView
android:id = "@+id/txtv_result"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_below = "@+id/btn_search"
android:layout_centerHorizontal = "true"
android:layout_marginTop = "38dp"
android:scrollbars = "vertical"
android:singleLine = "false"
android:text = "No results" /> |
1 | txtv_result.setMovementMethod(ScrollingMovementMethod.getInstance()); |
2.整體思路:
該功能比較簡單,所以整個思路也比較簡單,在觸發查詢的按鈕完成功能的編寫,主要實現的功能有獲取輸入的內容,存放在一個字符串,獲取根目錄的文件列表,結果爲一個FIle數組。執行一個循環,查詢每個文件的文件名是否包含所查詢的信息,有則把文件名及路徑存放到result字符串,最後把TextView的內容設置爲result字符串。
3. 源代碼實現:
(1)佈局文件:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 |
android:layout_width = "match_parent"
android:layout_height = "match_parent"
android:paddingBottom = "@dimen/activity_vertical_margin"
android:paddingLeft = "@dimen/activity_horizontal_margin"
android:paddingRight = "@dimen/activity_horizontal_margin"
android:paddingTop = "@dimen/activity_vertical_margin"
tools:context = ".MainActivity" >
< EditText
android:id = "@+id/et_searchinfo"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_alignParentTop = "true"
android:layout_centerHorizontal = "true"
android:layout_marginTop = "20dp"
android:ems = "10" />
< Button
android:id = "@+id/btn_search"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_below = "@+id/et_searchinfo"
android:layout_centerHorizontal = "true"
android:layout_marginTop = "22dp"
android:text = "Button" />
<!-- 設置scrollbars和singleLine的屬性,以實現TextView可滾動。 -->
< TextView
android:id = "@+id/txtv_result"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_below = "@+id/btn_search"
android:layout_centerHorizontal = "true"
android:layout_marginTop = "38dp"
android:scrollbars = "vertical"
android:singleLine = "false"
android:text = "No results" />
</ RelativeLayout > |
(2)Java文件:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | package cth.android.searchfile;
import java.io.File;
import android.app.Activity; import android.os.Bundle; import android.text.method.ScrollingMovementMethod; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView;
public class MainActivity extends Activity implements
android.view.View.OnClickListener {
private Button btn_search;
private TextView txtv_result;
private EditText et_searchinfo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* 添加各個控件 */
btn_search = (Button) findViewById(R.id.btn_search);
txtv_result = (TextView) findViewById(R.id.txtv_result);
et_searchinfo = (EditText) findViewById(R.id.et_searchinfo);
btn_search.setOnClickListener(this);
/*爲TextView添加垂直滑動的方法*/
txtv_result.setMovementMethod(ScrollingMovementMethod.getInstance());
}
@Override
public void onClick(View v) {
String result = "" ;
String searchinfo = et_searchinfo.getText().toString();
File[] fileList = new File( "/" ).listFiles();
for (File f : fileList) {
if (f.getName().indexOf(searchinfo) >= 0 ) {
result += f.getAbsolutePath() + "\n" ;
}
}
txtv_result.setText(result);
} } |