如何调试 Android 应用程序强制关闭错误？

Question

public class MainActivity extends Activity {

EditText oETextN;
EditText oETextPh;
Button oButtonSave;
public String givenName;
public String givenPhNum;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    findViewsById();
    oButtonSave.setOnClickListener(new OnClickListener(){
        public void onClick(View view){
            givenName = oETextN.getText().toString();
            givenPhNum = oETextPh.getText().toString();
            OrgiOperations.Insert2Contacts(getApplicationContext(),
                    givenName, givenPhNum);
            if (OrgiOperations.isTheNumberExistsinContacts(
                    getApplicationContext(), givenPhNum)) {
                Log.i(OrgiOperations.TAG, "Exists");
            } else {
                Log.i(OrgiOperations.TAG, "Not Exists");
            }

        }

    });

    setContentView(R.layout.activity_main);

}

private  void findViewsById(){
    oButtonSave = (Button) findViewById(R.id.SaveBtn);
    oETextN = (EditText) findViewById(R.id.FLName);
    oETextPh = (EditText) findViewById(R.id.Ph);

    //oEText = (EditText) findViewById(R.id.Name);

}

@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;
}

}

我一直在尝试制作一个简单的 Android 应用，将输入的详细信息（姓名和电话号码）直接保存到您的设备电话簿中。这是 MAIN 活动，其他类包含执行此操作的函数，我确信这些函数已正确实现。

当我在手机上运行应用程序时，问题就出现了，不幸的是，经过数小时的冷编码后，我得到了 FORCE CLOSE 错误！

Answer 1

改成

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

然后

  private  void initializeViews(){
    oButtonSave = (Button) findViewById(R.id.SaveBtn);
    oETextN = (EditText) findViewById(R.id.FLName);
    oETextPh = (EditText) findViewById(R.id.Ph);
    //oEText = (EditText) findViewById(R.id.Name); 
  }

你需要先给activity设置布局的内容，然后再初始化views。

还可以将 findViewsById(); 重命名为 initializeViews() 或更合适的名称，因为您使用 findViewById 将视图初始化为 oButtonSave = (Button) findViewById(R.id.SaveBtn);

编辑：

在视图初始化后有点击监听。

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main); 
 oButtonSave = (Button) findViewById(R.id.SaveBtn);
 oETextN = (EditText) findViewById(R.id.FLName);
 oETextPh = (EditText) findViewById(R.id.Ph);
    oButtonSave.setOnClickListener(new OnClickListener(){
    public void onClick(View view){
        givenName = oETextN.getText().toString();
        givenPhNum = oETextPh.getText().toString();
        OrgiOperations.Insert2Contacts(getApplicationContext(),
                givenName, givenPhNum);
        if (OrgiOperations.isTheNumberExistsinContacts(
                getApplicationContext(), givenPhNum)) {
            Log.i(OrgiOperations.TAG, "Exists");
        } else {
            Log.i(OrgiOperations.TAG, "Not Exists");
        }

    }

});
}