Java 将文本视图添加到LinearLayout不起作用
我有一个滚动视图,可以逐行列出程序的状态(onCreate、onPause、onResume等)。每次状态改变时,TextView的内容都会被覆盖,而不是换行 我已经试过几种方法了,但我真的不确定它到底出了什么问题 以下是我的java代码:Java 将文本视图添加到LinearLayout不起作用,java,android,textview,android-linearlayout,Java,Android,Textview,Android Linearlayout,我有一个滚动视图,可以逐行列出程序的状态(onCreate、onPause、onResume等)。每次状态改变时,TextView的内容都会被覆盖,而不是换行 我已经试过几种方法了,但我真的不确定它到底出了什么问题 以下是我的java代码: int numc= 0; int nums= 0; int numr= 0; int nump= 0; int numst=0; int numd= 0; TextView numCreate; TextView numStart; TextView nu
int numc= 0;
int nums= 0;
int numr= 0;
int nump= 0;
int numst=0;
int numd= 0;
TextView numCreate;
TextView numStart;
TextView numResume;
TextView numPause;
TextView numStop;
TextView numDestroy;
TextView tCreate;
TextView tStart;
TextView tResume;
TextView tPause;
TextView tStop;
TextView tDestroy;
LinearLayout linear;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lifecycle);
numc++;
Log.d("STATE", "onCreate executed");
displayCount();
linear= findViewById(R.id.linearLay);
TextView t1= new TextView(this);
t1.setText("onCreate executed");
linear.addView(t1);
}
@Override
public void onResume() {
super.onResume();
setContentView(R.layout.activity_lifecycle);
numr++;
Log.d("STATE", "onRes executed" + numr);
displayCount();
linear=findViewById(R.id.linearLay);
TextView t2= new TextView(this);
linear.addView(t2);
t2.setText("onResume executed");
}
@Override
public void onPause() {
super.onPause();
setContentView(R.layout.activity_lifecycle);
nump++;
Log.d("STATE", "onPause executed" + nump);
displayCount();
linear=findViewById(R.id.linearLay);
TextView t3= new TextView(this);
linear.addView(t3);
t3.setText("onPause executed");
Log.d("INCREMENT", String.valueOf(linear.getChildCount()));
}
试试这个
删除setContentView(R.layout.activity\u生命周期)代码>从onResume()
onPause()
示例代码
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lifecycle);
numc++;
Log.d("STATE", "onCreate executed");
displayCount();
TextView t1= new TextView(this);
t1.setText("onCreate executed");
linear.addView(t1);
}
@Override
public void onResume() {
super.onResume();
numr++;
Log.d("STATE", "onRes executed" + numr);
displayCount();
TextView t2= new TextView(this);
linear.addView(t2);
t2.setText("onResume executed");
}
@Override
public void onPause() {
super.onPause();
nump++;
Log.d("STATE", "onPause executed" + nump);
displayCount();
TextView t3= new TextView(this);
linear.addView(t3);
t3.setText("onPause executed");
Log.d("INCREMENT", String.valueOf(linear.getChildCount()));
}
您应该删除setContentView(R.layout.activity\u生命周期)代码>从onResume()
和onPause()
将文本设置到TextView
时,请使用“\n
,
例如
t1.setText(“onCreate executed”+“\n”);
从暂停事件中删除setContentView,您可以像这样在LinearLayout中添加Textview
TextView htext =new TextView(this);
textView.setText("Any Text");
textView.setId(123);
textView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
然后
linearlayout.addView(textView);
您不需要使用setContentView()
在每种方法中,只要在onCreate中使用它,这个函数就会将XML膨胀到屏幕上
一旦findViewById()就可以声明一个视图了,只需在create中执行即可
试试这个
例子
从onResume()
onPause()
删除setContentView(R.layout.activity\u生命周期);
,为什么您要一次又一次地使用这一行setContentView(R.layout.activity\u生命周期);?@AlexEspiritu很乐意帮助您
public class MainActivity extends AppCompatActivity {
LinearLayout linear;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
linear = findViewById(R.id.liner);
textView = new TextView(this);
textView.setText("onCreate executed");
linear.addView(textView);
}
@Override
public void onResume() {
super.onResume();
textView = new TextView(this);
textView.setText("onResume executed");
linear.addView(textView);
}
@Override
public void onPause() {
super.onPause();
textView = new TextView(this);
textView.setText("onPause executed");
linear.addView(textView);
}
}