1、擷取手機螢幕分辨率
final DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
System.out.println("手機分辨率:" + dm.widthPixels + "--" + dm.heightPixels); 2、控件跟随手指移動
首先在xml檔案中對頁面進行布局，在這裡我們放置一個按鈕，通過手指的移動來改變按鈕的位置
1 <?xml version="1.0" encoding="utf-8"?>
2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:tools="http://schemas.android.com/tools"
4 android:id="@+id/activity_02"
5 android:layout_width="match_parent"
6 android:layout_height="match_parent"
7 tools:context="com.example.whs.sample04.Activity02">
8
9 <Button
10 android:id="@+id/moveBtn"
11 android:layout_width="wrap_content"
12 android:layout_height="wrap_content"
13 android:text="測試"
14 />
15
16 </RelativeLayout> 在Activity中進行具體的實作：
1 package com.example.whs.sample04;
2
3 import android.support.v7.app.AppCompatActivity;
4 import android.os.Bundle;
5 import android.support.v7.widget.LinearLayoutCompat;
6 import android.view.MotionEvent;
7 import android.view.View;
8 import android.view.ViewGroup;
9 import android.widget.Button;
10 import android.widget.LinearLayout;
11 import android.widget.RelativeLayout;
12
13 //實作按鈕的界面響應
14 public class Activity02 extends AppCompatActivity {
15
16 int xSpan; //在觸控筆點選按鈕的情況下相對于按鈕自己坐标系的值
17 int ySpan;
18 private ViewGroup root;
19
20 Button btn;
21
22 @Override
23 protected void onCreate(Bundle savedInstanceState) {
24 super.onCreate(savedInstanceState);
25 setContentView(R.layout.activity_02);
26
27 root = (ViewGroup) findViewById(R.id.activity_02);
28 btn = (Button)findViewById(R.id.moveBtn);
29 btn.setOnTouchListener(new View.OnTouchListener() {
30 @Override
31 public boolean onTouch(View view, MotionEvent motionEvent) {
32 switch (motionEvent.getAction()){
33 case MotionEvent.ACTION_DOWN://按下
34 xSpan = (int)motionEvent.getRawX();
35 ySpan = (int)motionEvent.getRawY();
36 break;
37 case MotionEvent.ACTION_MOVE://移動
38
39 //擷取手指移動到了哪個點坐标
40 int xMove = (int)motionEvent.getRawX();
41 int yMove = (int)motionEvent.getRawY();
42 //相對于上一個點，手指在x,y方向上分别移動的距離
43 int dx = xMove - xSpan;
44 int dy = yMove - ySpan;
45 //擷取Button上一次各個邊距離父控件的距離
46 int left = view.getLeft();
47 int right = view.getRight();
48 int bottom = view.getBottom();
49 int top = view.getTop();
50 //設定本次Button的上 下 左 右各邊與父控件的距離
51 view.layout(left + dx,top + dy,right + dx,bottom + dy);
52 // 本次移動的結尾作為下一次移動的開始
53 xSpan = (int)motionEvent.getRawX();
54 ySpan = (int)motionEvent.getRawY();
55 break;
56 case MotionEvent.ACTION_UP:
57 break;
58 }
59 root.invalidate();
60 return true;//如果傳回true,從手指接觸螢幕到手指離開螢幕，将不會觸發點選事件。
61 }
62 });
63
64 }
65
66 } View Code
3、更改手機螢幕顯示方向
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:tools="http://schemas.android.com/tools"
4 android:id="@+id/activity_15"
5 android:layout_width="match_parent"
6 android:layout_height="match_parent"
7 android:orientation="vertical"
8 tools:context="com.example.whs.sample04.Activity15">
9
10 <RadioGroup
11 android:id="@+id/RadioGroup01"
12 android:layout_width="match_parent"
13 android:layout_height="wrap_content"
14 android:orientation="horizontal"
15 >
16 <RadioButton
17 android:id="@+id/radioButton01"
18 android:text="豎屏"
19 android:layout_width="wrap_content"
20 android:layout_height="wrap_content" />
21 <RadioButton
22 android:id="@+id/radioButton02"
23 android:text="橫屏"
24 android:layout_width="wrap_content"
25 android:layout_height="wrap_content" />
26
27
28 </RadioGroup>
29
30
31
32 </LinearLayout> 主要通過android.app.activity.getRequestedOrientation()來感覺螢幕的狀态，若傳回-1則無法識别螢幕狀态。用setRequestedOrientation來設定螢幕狀态。
1 package com.example.whs.sample04;
2
3 import android.content.pm.ActivityInfo;
4 import android.graphics.Color;
5 import android.support.v7.app.AppCompatActivity;
6 import android.os.Bundle;
7 import android.widget.RadioButton;
8 import android.widget.RadioGroup;
9 import android.widget.Toast;
10
11 //更改手機螢幕顯示方向
12 public class Activity15 extends AppCompatActivity {
13
14 @Override
15 protected void onCreate(Bundle savedInstanceState) {
16 super.onCreate(savedInstanceState);
17
18 setContentView(R.layout.activity_15);
19
20 RadioGroup rg = (RadioGroup)findViewById(R.id.RadioGroup01);
21 final RadioButton rbH = (RadioButton)findViewById(R.id.radioButton01);
22 final RadioButton rbV = (RadioButton)findViewById(R.id.radioButton02);
23 // 取得目前螢幕方向
24 final int orient = getRequestedOrientation();
25 if (orient == -1){
26 Toast.makeText(this, "無法區分橫豎屏！！", Toast.LENGTH_SHORT).show();
27 }
28 System.out.println("螢幕:" + orient);
29 RadioGroup.OnCheckedChangeListener mChange = new RadioGroup.OnCheckedChangeListener() {
30 @Override
31 public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
32 if (checkedId == rbH.getId()){//橫屏按鈕
33
34 if (orient == -1){
35 Toast.makeText(Activity15.this, "無法區分橫豎屏！！", Toast.LENGTH_SHORT).show();
36 }else {
37 if (orient == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){//若為橫屏,設定為豎屏
38 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
39 Toast.makeText(Activity15.this, "現在是豎屏啦！！", Toast.LENGTH_SHORT).show();
40 }
41 }
42
43 }else if (checkedId == rbV.getId()){//豎屏按鈕
44 if (orient == -1){
45 Toast.makeText(Activity15.this, "無法區分橫豎屏！！", Toast.LENGTH_SHORT).show();
46 }else {
47 if (orient == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){//若為豎屏,設定為橫屏
48 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
49 Toast.makeText(Activity15.this, "現在是橫屏啦！！", Toast.LENGTH_SHORT).show();
50 }
51 }
52 }
53 }
54 };
55 rg.setOnCheckedChangeListener(mChange); //RadioGroup添加監聽器
56
57 }
58 } View Code
3、擷取手機螢幕資訊
1 DisplayMetrics display = new DisplayMetrics();
2 //将目前視窗的一些資訊放在DisplayMetrics類中，
3 this.getWindowManager().getDefaultDisplay().getMetrics(display);
6 float density = display.density;
7 //輸出結果是 dens: density is 1.0
8 Log.e("dens","density is "+density);
9
10 //擷取螢幕像素密度
11 int densityDpi = display.densityDpi;
12 //輸出結果是 160
13 Log.e("dens","densityDpi is "+densityDpi);
14
15
16 //擷取螢幕的高度 結果機關 px
17 int heightPixels = display.heightPixels;
18 //輸出結果是 heightPixels is 480
19 Log.e("dens","heightPixels is "+heightPixels);
20
21
22 //擷取螢幕的寬度 結果機關 px
23 int widthPixels = display.widthPixels;
24 //輸出結果是 widthPixels is 320
25 Log.e("dens","widthPixels is "+widthPixels);
26
27
28 //擷取縮放比例
29 float scaledDensity = display.scaledDensity;
30 //輸出結果是 scaledDensity is 1.0
31 Log.e("dens","scaledDensity is "+scaledDensity);
32
33 float xdpi = display.xdpi;
34 float ydpi = display.ydpi;
35
36 //輸出結果是 xdpi is 160.0 ydpi 160.0
37 Log.e("dens","xdpi is "+xdpi+" ydpi "+ydpi);
38 
4、動态改變控件的位置和大小
xml檔案中的布局如下：
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent"
6 android:orientation="vertical"
7 android:id="@+id/lls"
8 >
9 <TextView
10 android:id="@+id/textView_test"
11 android:layout_width="100dp"
12 android:layout_height="44dp"
13 android:background="#294881"
14 />
15
16
17 </LinearLayout> 
(1)動态改變TextView的大小和位置
1 TextView textView = (TextView)findViewById(R.id.textView_test);
2 LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) textView.getLayoutParams();
3 Log.e("dens", String.valueOf(params.width));
4 if (params != null){
5 params.width = (int)(120 * scaledDensity);
6 params.height = (int)(40 * scaledDensity);
7 }
8 //設定左邊距
9 params.setMargins((int)(20 * scaledDensity), (int)(20 * scaledDensity), 0, 0); (2)動态添加TextView到布局中
1 //動态建立控件
2 LinearLayout mLlPrent = (LinearLayout)findViewById(R.id.lls);
3 TextView textView1 = new TextView(this);
4 //設定寬和高
5 LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams((int)(120 * scaledDensity), (int)(40 * scaledDensity));
6 //設定外邊距
7 layoutParams.setMargins((int)(20 * scaledDensity), (int)(60 * scaledDensity), 0, 0);
8 textView1.setPadding((int)(20 * scaledDensity), 0, 0, 0);
9 textView1.setText("執行");
10 textView1.setLayoutParams(layoutParams);
11 textView1.setBackgroundColor(Color.GRAY);
12 //添加到布局檔案中
13 mLlPrent.addView(textView1); 4、視圖坐标