黑马66期android学习笔记19_线性布局的特性和20_权重案例

一、项目结构






二、activity_main.xml代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="2"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal"
android:weightSum="4"
>
<TextView
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:text="TextView"
android:background="#ff0000"
/>
<TextView
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:text="TextView"
android:background="#000000"
/>
<TextView
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:text="TextView"
android:background="#ffffff"
/>
<TextView
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:text="TextView"
android:background="#00ff00"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical"
android:weightSum="4"
>
<TextView
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp"
android:text="TextView"
android:background="#ff0000"
/>
<TextView
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp"
android:text="TextView"
android:background="#00ff00"
/>
<TextView
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp"
android:text="TextView"
android:background="#0000ff"
/>
<TextView
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp"
android:text="TextView"
android:background="#ffffff"
/>
</LinearLayout>

</LinearLayout>


三、MainActivity.java代码

package com.example.linerlayout;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

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

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

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