初學，這段代碼也是在網上找的

開發選用的SDK是4.0,ADT是5.0，測試手機是4.4.4

在Layout_1中的傳遞代碼

Intent intentSimple = new Intent();

intentSimple.setClass(Layout_1.this,Layout_2.class);

Bundle bundleSimple = new Bundle();

bundleSimple.putString("username", username);

bundleSimple.putString("password",password);

intentSimple.putExtras(bundleSimple);

startActivity(intentSimple);

在Layout_2中的獲取代碼

Bundle bundle = this.getIntent().getExtras();

username = bundle.getString("username");

password = bundle.getString("password");

運行會出現這個錯誤提示“ java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference”

運行會出現一個錯誤提示“很抱歉，XXX已停止運行”，雖然出現這個錯誤提示，點擊“確定”之后程序會繼續運行，變量數據也能獲取到

請問如何處理?

全部代碼如下

Layout_1

package com.hl;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.Window;

import android.widget.TextView;

import android.widget.Toast;

public class Layout_1 extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.layout_1);

findViewById(R.id.login).setOnClickListener(new View.OnClickListener() {

public void onClick(View view) {

TextView usernameView = (TextView) findViewById(R.id.username);

String username = usernameView.getText().toString().trim();

TextView passwordView = (TextView) findViewById(R.id.password);

String password = passwordView.getText().toString().trim();

Intent intentSimple = new Intent();

intentSimple.setClass(Layout_1.this,Layout_2.class);

Bundle bundleSimple = new Bundle();

bundleSimple.putString("username", username);

bundleSimple.putString("password",password);

intentSimple.putExtras(bundleSimple);

startActivity(intentSimple);

Intent intent1 = new Intent(Layout_1.this, Layout_2.class);

startActivity(intent1);

}

});

}

}

Layout_2

package com.hl;

import android.app.Activity;

import android.os.Bundle;

import android.view.Window;

import android.widget.Toast;

public class Layout_2 extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.layout_2);

Bundle bundle = this.getIntent().getExtras();

String username = bundle.getString("username");

String password = bundle.getString("password");

Toast.makeText(Layout_2.this, username + " " + password, Toast.LENGTH_SHORT).show();

}

}

總結

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