打开一个app就闪退解决方法

打开一个app就闪退解决方法

最近在学android，这边有个小问题,打开这个应用就闪退是什么原因？package com.example.linearlayouttest;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.widget.Button;

import android.widget.LinearLayout;

public class LinearLayoutTest extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(yout.activity_linear_layout_test);

LinearLayout root =(LinearLayout)findViewById(R.id.root);

Button bn1=(Button)findViewById(R.id.bn1);

bn1.setText(R.string.bn1);

root.addView(bn1);

Button bn2=(Button)findViewById(R.id.bn2);

bn2.setText(R.string.bn2);

root.addView(bn2);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is prese nt.

getMenuInflater().inflate(R.menu.linear_layout_test, menu);

return true;

}

}

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:gravity="bottom|center_horizontal"

android:id="@+id/root"

>

android:id="@+id/bn1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/bn1"

/>

android:id="@+id/bn2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/bn2"

/>

android:id="@+id/bn3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/bn3"

/>

android:id="@+id/bn4"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/bn4"

/>

[解决办法]

LinearLayout root =(LinearLayout)findViewById(R.id.root); root.addView(bn1);

root.addView(bn2);