Android 开发笔记___FrameLayout

xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btn_add_frame"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="给下方的框架布局添加视图"
        android:textColor="#000000"
        android:textSize="17sp" />

    <FrameLayout
        android:id="@+id/fl_content"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:foreground="@mipmap/ic_launcher"
        android:foregroundGravity="top|center_horizontal" >
    </FrameLayout>

</LinearLayout>

java

package com.example.alimjan.hello_world;

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.LinearLayout;

/**
 * Created by alimjan on 7/2/2017.
 */


public class class_3_1_2 extends AppCompatActivity implements View.OnClickListener {

    private FrameLayout fl_content;
    private int[] mColorArray = {
            Color.BLACK, Color.WHITE, Color.RED, Color.YELLOW, Color.GREEN,
            Color.BLUE, Color.CYAN, Color.MAGENTA, Color.GRAY, Color.DKGRAY
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.code_3_1_2);

        fl_content = (FrameLayout) findViewById(R.id.fl_content);
        findViewById(R.id.btn_add_frame).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.btn_add_frame) {
            int random = (int) (Math.random()*10 % 10);
            View vv = new View(this);
            vv.setBackgroundColor(mColorArray[random]);
            LinearLayout.LayoutParams ll_params = new LinearLayout.LayoutParams(
                    ActionBar.LayoutParams.MATCH_PARENT, (random+1)*50);
            vv.setLayoutParams(ll_params);
            vv.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View vvv) {
                    fl_content.removeView(vvv);
                    return true;
                }
            });
            fl_content.addView(vv);
        }
    }

    public static void startHome(Context mContext) {
        Intent intent = new Intent(mContext, class_3_1_2.class);
        mContext.startActivity(intent);
    }

}