Android开发

2024-04-07 10:59| 来源: 网络整理| 查看: 265

实验内容

1. android 开发环境搭建，开发工具可以是eclipse+adt 或android studio。

2. 按照实验课要求制作对应的app小程序，实现按钮添加备忘，并且包含日期时间。

3. 编写并提交实验报告。

实验步骤

1.部分代码如下：

部分代码如下：

2、在MainActivity中显示布局及设定按钮功能

部分代码： public class MainActivity extends AppCompatActivity { public String makeTimeString(int year,int month,int day,int hour,int minute,String memoText) { return year + "年" + (month + 1) + "月" + day + "日" + hour+"时" +minute+ "分------" + memoText; } public ArrayList list=new ArrayList(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button b1 = (Button)findViewById(R.id.b1); b1.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { startActivityForResult(new Intent(MainActivity.this,Ctime.class),1); } }); } protected void onActivityResult (int requestCode, int resultCode, Intent data){ super.onActivityResult(requestCode,resultCode,data); if(requestCode == 1){ int year =data.getIntExtra("year",0); int month =data.getIntExtra("month",0); int day = data.getIntExtra("day",0); int hour = data.getIntExtra("hour",0); int minute = data.getIntExtra("minute",0); String memoText = data.getStringExtra("memoText"); String text = makeTimeString(year,month,day,hour,minute,memoText); ArrayAdapter adapter =new ArrayAdapter(this,android.R.layout.simple_list_item_1,list); adapter.add(text); ListView listView =(ListView)findViewById(R.id.L1); listView.setAdapter(adapter); } } }

3、在Ctime中获取日期时间等功能

public class Ctime extends AppCompatActivity { public int year; public int month; public int day; public int hour; public int minute; public String memoText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_ctime); DatePicker dp=(DatePicker)findViewById(R.id.datePicker); TimePicker tp=(TimePicker)findViewById(R.id.timePicker); tp.setIs24HourView(true); Calendar c = Calendar.getInstance(); year = c.get(Calendar.YEAR); month = c.get(Calendar.MONTH); day = c.get(Calendar.DAY_OF_MONTH); hour = c.get(Calendar.HOUR); minute = c.get(Calendar.MINUTE); dp.init(year, month, day, new DatePicker.OnDateChangedListener() { @Override public void onDateChanged(DatePicker datePicker, int year, int month, int day) { Ctime.this.year = year; Ctime.this.month =month; Ctime.this.day = day; } }); tp.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() { @Override public void onTimeChanged(TimePicker timePicker, int hour, int minute) { Ctime.this.hour = hour; Ctime.this.minute =minute; } }); Button b2 =(Button)findViewById(R.id.bt1); b2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { EditText text=(EditText)findViewById(R.id.edt1); memoText =text.getText().toString(); Intent data =new Intent(); data.putExtra("year",year); data.putExtra("month",month); data.putExtra("day",day); data.putExtra("hour",hour); data.putExtra("minute",minute); data.putExtra("memoText",memoText); setResult(1,data); finish(); } }); } public void Onclick(View view){ AlertDialog.Builder b = new AlertDialog.Builder(Ctime.this); b.setTitle("请绘制："); View MyView = new MyView(Ctime.this); b.setView(MyView); b.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }); b.show(); } }

4、新建MyView.java并完成绘制图像功能

public class MyView extends View { float firstX; float firstY; Path path; MyView(Context context) { super(context); path = new Path(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); Paint paint = new Paint(); paint.setColor(Color.BLUE); paint.setStrokeWidth(10); //让画出的图形是空心的 paint.setStyle(Paint.Style.STROKE); canvas.drawPath(path,paint); } @Override public boolean onTouchEvent(MotionEvent event) { int act = event.getAction(); if (act == MotionEvent.ACTION_DOWN) { float x = event.getX(); float y = event.getY(); firstX = x; firstY = y; path.moveTo(firstX,firstY); return true; } else if (act == MotionEvent.ACTION_MOVE) { float x = event.getX(); float y = event.getY(); path.lineTo(x,y); invalidate(); } return super.onTouchEvent(event); } } 实验结果

当按动“添加图像”按钮按钮时，添加图像如图：

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