Basic implementation of AlertDialog

public class MainActivity extends Activity {

	protected int i;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate (savedInstanceState);
		setContentView(R.layout.activity_main);
	}
	/*
	 * Text dialog: have its own fixed layout/click the external default to close the dialog/cancel button, if no logical operation is performed, the listening event can be directly written as null
	 */
	public void showText(View view) {
		// 1. Create a constructor object for AlertDialog
		Builder builder = new AlertDialog.Builder(MainActivity.this);
		// 2. Set the content of the dialog
		builder.setTitle("prompt box");//Title
		builder.setIcon(R.drawable.ic_launcher);//图标
		builder.setMessage("A simple prompt box");//Content
		// set the ok (positive) button
		builder.setPositiveButton("确定", new OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// Logical operation performed by click listener
				Toast.makeText(MainActivity.this, "Clicked the OK button", 0).show();
			}
		});
		// set the cancel (negative) button
		builder.setNegativeButton("取消", null);
		// 3. Display the dialog
		builder.show();
	}

	/*
	 * Pop-up radio dialog:
	 */
	public void showSingle(View view) {
		Builder builder = new AlertDialog.Builder(MainActivity.this);
		builder.setTitle("Please select gender");//Title
		builder.setIcon(R.drawable.ic_launcher);//图标
		/**
		 * items: all options ---- array checkedItem: the subscript of the item selected by default listener: listening for events
		 */
		final String[] items={"male","female","shemale"};
		builder.setSingleChoiceItems(items, 2, new OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				i=which;
			}
		});
		
		builder.setPositiveButton("确定", new OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				Toast.makeText(MainActivity.this, "Selected:" + items[i], 0).show();
			}
		});
		builder.show();
	}

	/*
	 * Multiple selection dialog
	 */
	public void showMore(View view) {
		Builder builder = new AlertDialog.Builder(MainActivity.this);
		builder.setTitle("Please choose a hobby");//Title
		/**
		 * items: array of displayed data
		 * checkedItems: Array of default checked states
		 * listener: listen for events
		 */
		final String[] items={"football","basketball","table tennis","badminton","glass ball"};
		final boolean[] checkedItems={true,false,false,false,false};
		builder.setMultiChoiceItems(items, checkedItems, new OnMultiChoiceClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which, boolean isChecked) {
				//Although no logical operation is performed,,, due to the existence of this listener,,, the set default state value can be changed
			}
		});
		
		builder.setPositiveButton("确定", new OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// Traverse the state to get the selected subscript and take the value
				for (int i = 0; i < checkedItems.length; i++) {
					if (checkedItems[i]) {//selected
						Toast.makeText(MainActivity.this, "Hobby is:"+items[i], 0).show();
					}
				}
			}
		});
		builder.show();
	}
	
	/*
	 * Pop up a custom dialog box: customize your own layout/you must find the control through your own view object/if you want to display it, use dialog.show()/manually close the method dialog.dismiss();
	 */
	public void showMine(View view){
		//1. Create a constructor object
		Builder builder = new AlertDialog.Builder(MainActivity.this);
		//2. Create an AlertDialog object through the constructor object,,,
		final AlertDialog dialog = builder.create();
		//3. Set your own layout (view object) through the AlertDialog object, ,,
		View contentView=View.inflate(MainActivity.this, R.layout.dialog_layout, null);
		dialog.setView(contentView);
		//4. Logical operations can be performed, ,, button monitoring, ,, to find controls or must pass, view objects to find
		Button btn = (Button) contentView.findViewById(R.id.btn);
		final EditText edit_text = (EditText) contentView.findViewById(R.id.edit_text);
		btn.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(MainActivity.this, edit_text.getText().toString(), 0).show();
				//In the custom dialog,,, you can manually close the dialog
				dialog.dismiss();
			}
		});
		//5. Display the dialog
		dialog.show();
	}
	
	public void show_window(View view) {
		View view2=View.inflate(MainActivity.this, R.layout.activity_main, null);
		View contentView=View.inflate(MainActivity.this, R.layout.pop_layout, null);
		final PopupWindow window = new PopupWindow(contentView, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
		
		window.setBackgroundDrawable(new BitmapDrawable());
		window.setOutsideTouchable(true);
		
		window.setFocusable(true);
		window.setTouchable(true);
		
		Button btn1 = (Button) contentView.findViewById(R.id.btn1);
		final EditText edit_text1 = (EditText) contentView.findViewById(R.id.edit_text1);
		
		btn1.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(MainActivity.this, edit_text1.getText().toString(), 0).show();
				window.dismiss();
			}
		});
		
		window.showAtLocation(view2, Gravity.BOTTOM, 0, 0);
	}
}