image.png

• .app\res\drawable:
  位圖文件 or 9 Patch文件 or Drawable對象等XML資源文件
• .app\res\layout
  布局文件
• .app\res\mipmap
  需要適應分辨率的文件放置處
  m<h<xh<xxh<xxxh
  拷貝圖片直接放mipmap文件夾C+V，會有選項
• .app\res\values
  顧名思義

• View類常用屬性：

android:id = "@+id/user"
android:background = "@mipmap/bg" // 圖片
android:background = "#FF00FF" // 單色
android:padding = "16dp" // 組件offset 四個方向一樣
android:padding = "@dimen/activity_margin" // 組件offset 用資源變量標識
android:paddingLeft // 不同方向邊距
android:paddingTop
android:paddingRight
android:paddingBottom
android:paddingStart // 同Left
android:paddingEnd // 同Right

• ViewGroup.LayoutParams類：
  組件大小

android:layout_width="229dp"
android:layout_height="80dp" //可用常量見下
FILL_PARENT // 與父容器相同
MATCH_PARENT // 功能同上
WRAP_CONTENT // 自適應

• ViewGroup.MarginLayoutParams類：
  即外邊距

android:layout_marginTop
android:layout_marginBottom
android:layout_marginLeft // Start
android:layout_marginRight // End

• UI界面開發(fā)方式：
  1.XML
  2.JAVA
  3.XML+JAVA
  4.自定義view
  在Activity中使用下述代碼顯示XML布局文件內容
  setContentView(R.layout.activity_main);
• 使用JAVA編寫布局管理器：

        FrameLayout myframeLayout = new FrameLayout(this);
        myframeLayout.setBackgroundResource(R.mipmap.bg);
        setContentView(myframeLayout);
        TextView text1 = new TextView(this);
        text1.setText("Text1");
        text1.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18);
        text1.setTextColor(Color.rgb(11,85,114));
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        params.gravity = Gravity.CENTER;
        text1.setLayoutParams(params);
        text1.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                new AlertDialog.Builder(MainActivity.this).setTitle("Tip").setMessage("Mess").setPositiveButton("Sure", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Log.i("Get in","In");
                    }
                }).setNegativeButton("Exit", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Log.i("suss Exit","Exit");
                        finish();
                    }
                }).show();
            }

        });
        myframeLayout.addView(text1);

• JAVA和XML混合：
  MainActivity:

    private ImageView[] img=new ImageView[12];
    private int[] imagePath=new int[]{
            R.mipmap.i0,R.mipmap.i1,R.mipmap.i2,R.mipmap.i3,
            R.mipmap.i4,R.mipmap.i5,R.mipmap.i6,R.mipmap.i7,
            R.mipmap.i8,R.mipmap.i9,R.mipmap.i10,R.mipmap.i11
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        GridLayout layout=(GridLayout)findViewById(R.id.layout);
        for(int i=0;i<imagePath.length;i++) {
            img[i] = new ImageView(MainActivity.this);
            img[i].setImageResource(imagePath[i]);
            img[i].setPadding(2,2,2,2);
            ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(116,68);
            img[i].setLayoutParams(params);
            layout.addView(img[i]);

        };
        }

activity_main.xml中加入:

    android:id="@+id/layout"
    android:orientation="horizontal"
    android:rowCount="3"
    android:columnCount="4"

• 開發(fā)自定義View
  MainActivity:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FrameLayout frameLayout = findViewById(R.id.mylayout);
        final MyView myView = new MyView(this);
        myView.setOnTouchListener(new View.OnTouchListener(){
            @Override
            public boolean onTouch(View v, MotionEvent event){
                myView.bitmapX = event.getX();
                myView.bitmapY = event.getY();
                myView.invalidate();
                return true;
            }
        });
        frameLayout.addView(myView);
    }
}

創(chuàng)建MyView.java:

public class MyView extends View {
    public float bitmapX;
    public float bitmapY;
    public MyView(Context context) {
        super(context);
        bitmapX = 290;
        bitmapY = 130;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint paint = new Paint();
        Bitmap bitmap = BitmapFactory.decodeResource(this.getResources(),R.mipmap.m);
        canvas.drawBitmap(bitmap, bitmapX, bitmapY, paint);
        if(bitmap.isRecycled()){
            bitmap.recycle();
        }
    }
}

activity_main.xml中加入

    android:background="@mipmap/bg"
    android:id="@+id/mylayout"

• 常用布局管理器
  RelativeLayout
  LinearLayout
  FrameLayout
  TableLayout
  Gridlayout
  ConstraintLayout
  AbsoluteLayout