Android学习之——APP番茄工作法——小结（2）

浏览数：27 / 时间：2015年06月11日

上一篇连接：http://blog.csdn.net/fu222cs98/article/details/21053491

继续上一篇

问题十一：在Fragment实现类中中加载资源文件的方式：

在onCreate方法中：

LayoutInflater inflater = getActivity().getLayoutInflater();
mMainView = inflater.inflate(R.layout.task_layout_main, (ViewGroup)getActivity().findViewById(R.id.viewpager), false);

重写onCreateView方法

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO 自动生成的方法存根
    Log.i("MAIN", "^^^^^^^^TaskFragment^^^^^^^^onCreateView^^^^^^^^");
    ViewGroup p = (ViewGroup) mMainView.getParent();
    if (p != null) {
        p.removeAllViewsInLayout();
        Log.i("MAIN", "^^^^^^^^TaskFragment^^^^^^^^removeAllViewsInLayout!!!!!!!!");
    }
    return mMainView;
}

问题十二：SQLiteHelper实现类：

package com.android.tomatotask.Task;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class SqliteHelper extends SQLiteOpenHelper {
      private static String INFONAME;
      private static String NAME;
      private static int VERSION = 1;
      static
      {
        NAME = " table_notepad";
        INFONAME = "notepad.db";
      }
      public SqliteHelper(Context paramContext, String paramString, SQLiteDatabase.CursorFactory paramCursorFactory, int paramInt)
      {
        super(paramContext, INFONAME, null, VERSION);
      }
      public void onCreate(SQLiteDatabase paramSQLiteDatabase)
      {
        paramSQLiteDatabase.execSQL("create table " + NAME + "(id INTEGER PRIMARY KEY AUTOINCREMENT,title TEXT)");
      }
 
      public void onUpgrade(SQLiteDatabase paramSQLiteDatabase, int paramInt1, int paramInt2)
      {
      }
}

问题十三：SQLite改变的类

package com.android.tomatotask.Task;
import java.util.ArrayList;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
public class ChangeSqlite {
    public static String table = "table_notepad";
    public long add(SQLiteDatabase paramSQLiteDatabase, Notepad paramNotepad) {
        ContentValues localContentValues = new ContentValues();
        localContentValues.put("title", paramNotepad.getTitle());
        long l = paramSQLiteDatabase.insert(table, null, localContentValues);
        paramSQLiteDatabase.close();
        return l;
    }
    public void delete(SQLiteDatabase paramSQLiteDatabase, Notepad paramNotepad) {
        paramSQLiteDatabase.delete(table, "id=" + paramNotepad.getid(), null);
        paramSQLiteDatabase.close();
    }
 
    public ArrayList<Notepad> query(SQLiteDatabase paramSQLiteDatabase) {
        ArrayList<Notepad> localArrayList = new ArrayList<Notepad>();
        Cursor localCursor = paramSQLiteDatabase.query(table, new String[] {
                "id", "title" }, null, null, null, null, null);
        while (true) {
            if (!localCursor.moveToNext()) {
                paramSQLiteDatabase.close();
                return localArrayList;
            }
            Notepad localNotepad = new Notepad();
            localNotepad.setid(localCursor.getString(localCursor
                    .getColumnIndex("id")));
            localNotepad.setTitle(localCursor.getString(localCursor
                    .getColumnIndex("title")));
            localArrayList.add(localNotepad);
        }
    }
    public void update(SQLiteDatabase paramSQLiteDatabase, Notepad paramNotepad) {
        ContentValues localContentValues = new ContentValues();
        localContentValues.put("title", paramNotepad.getTitle());
        paramSQLiteDatabase.update(table, localContentValues, "id="
                + paramNotepad.getid(), null);
        paramSQLiteDatabase.close();
    }
}

问题十二和问题十三的实现：

SQLiteDatabase localSqLiteDatabase = new SqliteHelper(getActivity(), null, null, 0).getWritableDatabase();
Notepad localNotepad = new Notepad();//自己定义的类
ChangeSqlite localChangeSqlite = new ChangeSqlite();
String strContent = editText.getText().toString();
if (strContent.equals("")) {
    Toast.makeText(getActivity(), "内容为空", Toast.LENGTH_SHORT).show();
}
String strTitle=strContent.length()>11?" "+strContent.substring(0, 11):strContent;
localNotepad.setContent(strContent);
localNotepad.setTitle(strTitle);
localNotepad.setdata(date);
localChangeSqlite.add(localSqLiteDatabase, localNotepad);

问题十四：重写TextView，使之每行带横线的效果：

package com.android.tomatotask.Task;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
public class DateLine extends TextView {
    private Paint ePaint = new Paint();
    public DateLine(Context context) {
        super(context);
        // TODO 自动生成的构造函数存根
    }
    public DateLine(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO 自动生成的构造函数存根
        this.ePaint.setColor(-16777216);
        this.ePaint.setStyle(Paint.Style.STROKE);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        // TODO 自动生成的方法存根
        canvas.drawLine(0.0F, 40.0F, getWidth(), 40.0F, this.ePaint);
        super.onDraw(canvas);
    }
}

或者如下代码：

package com.android.tomatotask.Task;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
public class TextViewLine extends TextView {
    private Paint ePaint = new Paint();
    public TextViewLine(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO 自动生成的构造函数存根
        this.ePaint.setColor(-16777216);
        this.ePaint.setStyle(Paint.Style.STROKE);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        // TODO 自动生成的方法存根
        super.onDraw(canvas);
        int i=getLineCount();
        for (int j = 0; ; ++j)
        {
          if (j >= i)
          {
            super.onDraw(canvas);
            return;
          }
          float[] arrayOfFloat = new float[4];
          arrayOfFloat[0] = 15.0F;
          arrayOfFloat[1] = ((j + 1) * getLineHeight());
          arrayOfFloat[2] = (-20 + getWidth());
          arrayOfFloat[3] = ((j + 1) * getLineHeight());
          canvas.drawLines(arrayOfFloat, this.ePaint);
        }
    }
}

问题十五：重写EditText，使之每行带横线的效果：

package com.android.tomatotask.Task;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.EditText;
public class DrawLine extends EditText {
    private Paint ePaint;
    // private Rect rect;
    public DrawLine(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
        ePaint = new Paint();
        // rect=new Rect();
        ePaint.setColor(Color.BLACK);
        ePaint.setStyle(Paint.Style.STROKE);
    }
    // 标记3，此处线字交叉是由于行间距引起,注意使用getLineHeight()得到行高。
    public void onDraw(Canvas canvas) {
        int count = getLineCount();
        for (int i = 0; i < count + 11; i++) {
            float[] pts = { 15.0F, (i + 1) * getLineHeight(),
                    this.getWidth() - 20.0F, (i + 1) * getLineHeight() };
            // i*50-280,50增加则行间距大285增加则线靠上。
            // canvas.drawLine(15, i*42, this.getWidth()-20,i*42, ePaint);
            canvas.drawLines(pts, ePaint);
        }
        super.onDraw(canvas);
    }
}

问题十四和问题十五的XML：

<com.android.tomatotask.Task.DateLine
     android:textColor="#ffff0000"
    android:gravity="center" android:id="@id/editdate" android:background="@drawable/shapetop"
    android:layout_width="300.0dip" android:layout_height="30.0dip"
     android:layout_centerHorizontal="true" />
<com.android.tomatotask.Task.DrawLine android:textSize="18.0sp"
    android:textColor="#ff000000" android:gravity="top" android:id="@id/edittexttwo"
    android:background="@drawable/shape" android:scrollbars="vertical"
    android:layout_width="300.0dip" android:layout_height="100.0dip"
    android:layout_below="@id/editdate" android:layout_centerHorizontal="true"
    android:lineSpacingExtra="3.0dip" />

<com.android.tomatotask.Task.DateLine
    android:textColor="#ffff0000" android:gravity="center" android:id="@id/changedateview"
    android:background="@drawable/shapetop" android:layout_width="300.0dip"
    android:layout_height="27.0dip" android:layout_marginTop="8.0dip"
    android:layout_centerHorizontal="true" />
<com.android.tomatotask.Task.TextViewLine
    android:textSize="15.0sp" android:textColor="#ff000000" android:id="@id/changecontentview"
    android:background="@drawable/shape" android:layout_width="300.0dip"
    android:layout_height="wrap_content" android:minHeight="68.0dip"
    android:layout_below="@id/changedateview"
    android:layout_centerHorizontal="true" android:lineSpacingExtra="6.0dip" />

问题十六：取消标题行显示：

在styles.xml文件中

<style name="AppTheme" parent="AppBaseTheme">
    <!-- All customizations that are NOT specific to a particular API-level can go here. -->
    <item name="android:windowNoTitle">true</item>
</style>

注：为了阅读体验以及排版效果，本文代码与实际番茄工作法项目中代码有出入。仅作参考

应用截图：