安卓实验报告

　实 验六、 布局管理器 一、实验目的及任务 1、掌握 Activity 中各种布局管理器（LinearLayout,TableLayout,RelativeLayout,FrameLayout,GridLayout）的使用 2、掌握各种布局管理器的嵌套。

　二、实验环境 1、Jdk 2、Eclipse 3、Android

　SDK 三、实验步骤 代码：

　package com.example.tuo2;

　import java.util.Calendar; import java.util.TimeZone;

　import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.os.Handler; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout;

　public class ClockActivity extends Activity {

　 private final int FP = ViewGroup.LayoutParams.FILL_PARENT;

　private final int WC = ViewGroup.LayoutParams.WRAP_CONTENT;

　 private QAnalogClock clock1;

　 public void onCreate(Bundle savedInstanceState) {

　 super.onCreate(savedInstanceState);

　 LinearLayout lLayout = new LinearLayout(this);

　 lLayout.setLayoutParams(new LinearLayout.LayoutParams(FP, FP));

　 lLayout.setOrientation(LinearLayout.VERTICAL);

　clock1 = new QAnalogClock(this, "GMT+8:00");

　 lLayout.addView(clock1, new LinearLayout.LayoutParams(WC, WC));

　setContentView(lLayout);

　}

　 class QAnalogClock extends View {

　 Bitmap mBmpDial;

　 Bitmap mBmpHour;

　 Bitmap mBmpMinute;

　 Bitmap mBmpSecond;

　BitmapDrawable bmdHour;

　BitmapDrawable bmdMinute;

　 BitmapDrawable bmdSecond;

　 BitmapDrawable bmdDial;

　Paint mPaint;

　Handler tickHandler;

　int mWidth;

　 int mHeigh;

　 int mTempWidth;

　 int mTempHeigh;

　 int centerX;

　 int centerY;

　int availableWidth = 150;

　 int availableHeight = 300;

　private String sTimeZoneString;

　public QAnalogClock(Context context, String sTime_Zone) {

　super(context);

　sTimeZoneString = sTime_Zone;

　 mBmpHour = BitmapFactory.decodeResource(getResources(),

　R.drawable.android_clock_hour);

　bmdHour = new BitmapDrawable(mBmpHour);

　 mBmpMinute = BitmapFactory.decodeResource(getResources(),

　R.drawable.android_clock_minute);

　bmdMinute = new BitmapDrawable(mBmpMinute);

　 mBmpSecond = BitmapFactory.decodeResource(getResources(),

　R.drawable.android_clock_minute);

　bmdSecond = new BitmapDrawable(mBmpSecond);

　 mBmpDial = BitmapFactory.decodeResource(getResources(),

　R.drawable.android_clock_dial);

　bmdDial = new BitmapDrawable(mBmpDial);

　mWidth = mBmpDial.getWidth();

　mHeigh = mBmpDial.getHeight();

　centerX = availableWidth;

　centerY = availableHeight / 2;

　 mPaint = new Paint();

　mPaint.setColor(Color.RED);

　run();

　 }

　public void run() {

　tickHandler = new Handler();

　tickHandler.post(tickRunnable);

　 }

　private Runnable tickRunnable = new Runnable() {

　public void run() {

　postInvalidate();

　 tickHandler.postDelayed(tickRunnable, 1000);

　}

　 };

　protected void onDraw(Canvas canvas) {

　super.onDraw(canvas);

　 Calendar cal = Calendar.getInstance(TimeZone

　.getTimeZone(sTimeZoneString));

　int hour = cal.get(Calendar.HOUR);

　int minute = cal.get(Calendar.MINUTE);

　int second = cal.get(Calendar.SECOND);

　float hourRotate = hour * 30.0f + minute / 60.0f * 30.0f;

　float minuteRotate = minute * 6.0f;

　float secondRotate = second * 6.0f;

　 boolean scaled = false;

　 if (availableWidth < mWidth || availableHeight < mHeigh) {

　 scaled = true;

　 float scale = Math.min((float) availableWidth / (float) mWidth,

　 (float) availableHeight / (float) mHeigh);

　 canvas.save();

　 canvas.scale(scale, scale, centerX, centerY);

　}

　 bmdDial.setBounds(centerX - (mWidth / 2), centerY - (mHeigh / 2),

　centerX + (mWidth / 2), centerY + (mHeigh / 2));

　bmdDial.draw(canvas);

　 mTempWidth = bmdHour.getIntrinsicWidth();

　mTempHeigh = bmdHour.getIntrinsicHeight();

　canvas.save();

　canvas.rotate(hourRotate, centerX, centerY);

　bmdHour.setBounds(centerX - (mTempWidth / 2), centerY

　- (mTempHeigh / 2), centerX + (mTempWidth / 2), centerY

　+ (mTempHeigh / 2));

　bmdHour.draw(canvas);

　 canvas.restore();

　 mTempWidth = bmdMinute.getIntrinsicWidth();

　mTempHeigh = bmdMinute.getIntrinsicHeight();

　canvas.save();

　canvas.rotate(minuteRotate, centerX, centerY);

　bmdMinute.setBounds(centerX - (mTempWidth / 2), centerY

　- (mTempHeigh / 2), centerX + (mTempWidth / 2), centerY

　+ (mTempHeigh / 2));

　 bmdMinute.draw(canvas);

　 canvas.restore();

　 mTempWidth = bmdSecond.getIntrinsicWidth();

　mTempHeigh = bmdSecond.getIntrinsicHeight();

　canvas.rotate(secondRotate, centerX, centerY);

　bmdSecond.setBounds(centerX - (mTempWidth / 2), centerY

　- (mTempHeigh / 2), centerX + (mTempWidth / 2), centerY

　+ (mTempHeigh / 2));

　bmdSecond.draw(canvas);

　 if (scaled) {

　 canvas.restore();

　}

　 }

　}

　} 实验结果：

　四.实验总结 实现时钟界面需要在 java 代码中做指针和表盘的布局，实现对指针的线程控制。