疯狂安卓书籍的学习--未完待续~

疯狂安卓书籍的学习

如何自定义view

先建一个view类 重写ondraw方法

   public class DrawView extends View {    public float currentX = 40;    public float currentY = 50;    // 定义并创建画笔    Paint paint = new Paint();    public DrawView(Context context) {        super(context);        // TODO Auto-generated constructor stub    }    public DrawView(Context context, AttributeSet attrs) {        super(context, attrs);        // TODO Auto-generated constructor stub    }    @Override    protected void onDraw(Canvas canvas) {        // TODO Auto-generated method stub        super.onDraw(canvas);        //设置画笔的颜色        paint.setColor(Color.GREEN);        canvas.drawCircle(currentX, currentY, 15, paint);           }    @Override    public boolean onTouchEvent(MotionEvent event) {        // TODO Auto-generated method stub        currentX=event.getX();        currentY=event.getY();        invalidate();//重新绘制        //表名 该处理方法已经处理        return true;    }    }再在activity中将view类添加进去    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        RelativeLayout view=(RelativeLayout) findViewById(R.id.root);        DrawView drawView=new DrawView(this);        view.addView(drawView);    }也可以直接在布局文件中添加这个自定义控件    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:id="@+id/root"    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="com.example.android.MainActivity" >    <com.example.android.DrawView     android:id="@+id/diydraw"    android:layout_width="wrap_content"    android:layout_height="wrap_content"/>    </RelativeLayout>

效果如下

计算器

布局文件如下

    <?xml version="1.0" encoding="utf-8"?>    <GridLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"     android:rowCount="6"    android:columnCount="4"    android:id="@+id/root"    >    <TextView     android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_columnSpan="4"    android:textSize="50dp"    android:layout_marginLeft="2pt"    android:layout_marginRight="2pt"    android:layout_gravity="right"    android:text="0"/>    <Button android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_columnSpan="4"    android:text="清除"/>    </GridLayout>

activity文件如下

    public class MainActivity extends Activity {    GridLayout girdlayout;    String[] omg = { "1", "2", "3", "/", "4", "5", "6", "*", "7", "8", "9", "-", ".", "0", "=", "+", };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.caculator);        girdlayout = (GridLayout) findViewById(R.id.root);        for (int i = 0; i < omg.length; i++) {            Button button = new Button(this);            button.setText(omg[i]);            button.setTextSize(40);        button.setPadding(5, 35, 5, 35);        //指定该组件所在列        GridLayout.Spec rowSpec=GridLayout.spec(i/4+2);        GridLayout.Spec columnSpec=GridLayout.spec(i%4);        GridLayout.LayoutParams params=new GridLayout.LayoutParams(rowSpec, columnSpec);        params.setGravity(Gravity.FILL);        girdlayout.addView(button, params);        }    }    }

效果如图

智能填充

布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:id="@+id/root"android:orientation="vertical"    ><AutoCompleteTextView     android:id="@+id/auto"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:completionThreshold="1"    /><MultiAutoCompleteTextView     android:id="@+id/mauto"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:completionThreshold="1"    /></LinearLayout>代码public class zidongtianchong extends Activity {    AutoCompleteTextView act;    MultiAutoCompleteTextView mact;    String[] omg = new String[] { "1", "12", "123", "1234", };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),                android.R.layout.simple_dropdown_item_1line, omg);    act=(AutoCompleteTextView) findViewById(R.id.auto);    act.setAdapter(adapter);    mact=(MultiAutoCompleteTextView) findViewById(R.id.mauto);    mact.setAdapter(adapter);    //设置分割符    mact.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());    }}

效果如下：

补充：

requestWindowFeatrue（window.Featrue_Progress）;
设置标题栏为progressbar；

拖动栏SeekBar的监听方法